diff --git a/changes/log-export-local-date.md b/changes/log-export-local-date.md
new file mode 100644
index 00000000..ed988076
--- /dev/null
+++ b/changes/log-export-local-date.md
@@ -0,0 +1,5 @@
+type: fixed
+area: logs
+
+- Fixed log filenames to use the user's local date so log export includes the current logs instead of stale prior-day logs around UTC midnight.
+- Expanded log export redaction to mask common PII and secrets, including IP addresses, emails, auth/cookie headers, yt-dlp cookie arguments, URL credentials, compound token/key/password fields, and signed YouTube media URL query strings.
diff --git a/docs-site/configuration.md b/docs-site/configuration.md
index b2a8f99f..6d6cf0ea 100644
--- a/docs-site/configuration.md
+++ b/docs-site/configuration.md
@@ -188,6 +188,9 @@ Control the minimum log level for runtime output:
 | `files.launcher` | boolean                                  | Write launcher command logs (default: `true`)                        |
 | `files.mpv`      | boolean                                  | Write mpv player logs. Enable temporarily for mpv/plugin debugging.  |
 
+Log filenames use the local calendar date, for example `app-YYYY-MM-DD.log`, `launcher-YYYY-MM-DD.log`, and `mpv-YYYY-MM-DD.log`.
+Log export creates a sanitized copy of those files; it does not rewrite the original log files on disk.
+
 ### Updates
 
 Configure automatic update checks and update notifications:
diff --git a/docs-site/launcher-script.md b/docs-site/launcher-script.md
index fd5db4e7..d86bd11b 100644
--- a/docs-site/launcher-script.md
+++ b/docs-site/launcher-script.md
@@ -83,7 +83,7 @@ subminer stats -b                       # start background stats daemon
 | `subminer stats cleanup`                   | Backfill vocabulary metadata and prune stale rows                  |
 | `subminer doctor`                          | Dependency + config + socket diagnostics                           |
 | `subminer settings`                        | Open the SubMiner settings window                                  |
-| `subminer logs -e`                         | Export a sanitized log ZIP and print its path                      |
+| `subminer logs -e`                         | Export a sanitized local-date log ZIP and print its path           |
 | `subminer config path`                     | Print active config file path                                      |
 | `subminer config show`                     | Print active config contents                                       |
 | `subminer mpv status`                      | Check mpv socket readiness                                         |
diff --git a/docs-site/usage.md b/docs-site/usage.md
index 4ddf0d22..35196448 100644
--- a/docs-site/usage.md
+++ b/docs-site/usage.md
@@ -148,7 +148,7 @@ SubMiner.AppImage --dictionary-select --dictionary-anilist-id 21355  # Pin corre
 SubMiner.AppImage --help                  # Show all options
 ```
 
-The tray menu includes `Export Logs`, which creates the same sanitized log ZIP as `subminer logs -e` and shows the archive path when complete.
+The tray menu includes `Export Logs`, which creates the same sanitized local-date log ZIP as `subminer logs -e` and shows the archive path when complete. Export sanitization masks common PII and secrets, including home-directory usernames, IP addresses, emails, auth/cookie headers, yt-dlp cookie arguments, URL credentials, token/key/password fields, and signed YouTube media URL query strings. The exported copy is sanitized; source log files remain unredacted on disk.
 
 Once Jellyfin is configured, the tray menu includes `Jellyfin Discovery` for starting or stopping cast discovery in the current app session without changing config.
 
@@ -191,7 +191,7 @@ This flow requires `mpv.exe` to be discoverable. Leave `mpv.executablePath` blan
 - `subminer jellyfin` / `subminer jf`: Jellyfin-focused workflow aliases.
 - `subminer doctor`: health checks for core dependencies and runtime paths.
 - `subminer settings`: open the SubMiner settings window (also `subminer --settings`).
-- `subminer logs -e`: export a sanitized ZIP of today's logs, or the most recent logs when no current-day log exists.
+- `subminer logs -e`: export a sanitized ZIP of today's local-date logs, or the most recent logs when no current-day log exists. The exported copy masks common PII and secrets; on-disk logs are unchanged.
 - `subminer config`: config file helpers (`path`, `show`).
 - `subminer mpv`: mpv helpers (`status`, `socket`, `idle`).
 - `subminer dictionary <path>`: generates a Yomitan-importable character dictionary ZIP from a file/directory target.
diff --git a/launcher/log.test.ts b/launcher/log.test.ts
index fa898d15..aabd2a44 100644
--- a/launcher/log.test.ts
+++ b/launcher/log.test.ts
@@ -2,9 +2,10 @@ import test from 'node:test';
 import assert from 'node:assert/strict';
 import path from 'node:path';
 import { getDefaultLauncherLogFile, getDefaultMpvLogFile } from './types.js';
+import { localDateKey } from '../src/shared/log-files.js';
 
 test('getDefaultMpvLogFile uses APPDATA on windows', () => {
-  const today = new Date().toISOString().slice(0, 10);
+  const today = localDateKey(new Date());
   const resolved = getDefaultMpvLogFile({
     platform: 'win32',
     homeDir: 'C:\\Users\\tester',
@@ -20,7 +21,7 @@ test('getDefaultMpvLogFile uses APPDATA on windows', () => {
 });
 
 test('getDefaultLauncherLogFile uses launcher prefix', () => {
-  const today = new Date().toISOString().slice(0, 10);
+  const today = localDateKey(new Date());
   const resolved = getDefaultLauncherLogFile({
     platform: 'linux',
     homeDir: '/home/tester',
diff --git a/src/logger.test.ts b/src/logger.test.ts
index cda4f694..bce6dd73 100644
--- a/src/logger.test.ts
+++ b/src/logger.test.ts
@@ -2,9 +2,10 @@ import test from 'node:test';
 import assert from 'node:assert/strict';
 import path from 'node:path';
 import { resolveDefaultLogFilePath, setLogRotation } from './logger';
+import { localDateKey } from './shared/log-files';
 
 test('resolveDefaultLogFilePath uses APPDATA on windows', () => {
-  const today = new Date().toISOString().slice(0, 10);
+  const today = localDateKey(new Date());
   const resolved = resolveDefaultLogFilePath({
     platform: 'win32',
     homeDir: 'C:\\Users\\tester',
@@ -20,7 +21,7 @@ test('resolveDefaultLogFilePath uses APPDATA on windows', () => {
 });
 
 test('resolveDefaultLogFilePath uses .config on linux', () => {
-  const today = new Date().toISOString().slice(0, 10);
+  const today = localDateKey(new Date());
   const resolved = resolveDefaultLogFilePath({
     platform: 'linux',
     homeDir: '/home/tester',
@@ -34,7 +35,7 @@ test('resolveDefaultLogFilePath uses .config on linux', () => {
 
 test('setLogRotation accepts numeric retention days', () => {
   const previous = process.env.SUBMINER_LOG_ROTATION;
-  const today = new Date().toISOString().slice(0, 10);
+  const today = localDateKey(new Date());
   setLogRotation(14);
   try {
     const resolved = resolveDefaultLogFilePath({
diff --git a/src/main/runtime/log-export.test.ts b/src/main/runtime/log-export.test.ts
index 854b9456..25cec0f5 100644
--- a/src/main/runtime/log-export.test.ts
+++ b/src/main/runtime/log-export.test.ts
@@ -14,6 +14,20 @@ function cleanupDir(dirPath: string): void {
   fs.rmSync(dirPath, { recursive: true, force: true });
 }
 
+function withTimeZone<T>(timeZone: string, run: () => T): T {
+  const previous = process.env.TZ;
+  process.env.TZ = timeZone;
+  try {
+    return run();
+  } finally {
+    if (previous === undefined) {
+      delete process.env.TZ;
+    } else {
+      process.env.TZ = previous;
+    }
+  }
+}
+
 function writeLog(logsDir: string, name: string, content: string, mtime: string): string {
   const logPath = path.join(logsDir, name);
   fs.writeFileSync(logPath, content, 'utf8');
@@ -67,6 +81,80 @@ test('maskUsernamesInLogText redacts linux macOS and Windows home paths', () =>
   assert.doesNotMatch(masked, /kyle/);
 });
 
+test('maskUsernamesInLogText redacts IP addresses and emails', () => {
+  const masked = maskUsernamesInLogText(
+    [
+      'ffmpeg failed after request from public ip 203.0.113.42',
+      'connect tcp 192.168.1.25:443: i/o timeout',
+      'remote addr [2001:db8::1234]:443',
+      'support email kyle@example.test',
+    ].join('\n'),
+  );
+
+  assert.match(masked, /public ip <ip>/);
+  assert.match(masked, /tcp <ip>:443/);
+  assert.match(masked, /remote addr \[<ip>\]:443/);
+  assert.match(masked, /support email <email>/);
+  assert.doesNotMatch(masked, /203\.0\.113\.42/);
+  assert.doesNotMatch(masked, /192\.168\.1\.25/);
+  assert.doesNotMatch(masked, /2001:db8::1234/);
+  assert.doesNotMatch(masked, /kyle@example\.test/);
+});
+
+test('maskUsernamesInLogText redacts headers and yt-dlp cookie arguments', () => {
+  const masked = maskUsernamesInLogText(
+    [
+      'Authorization: Bearer ya29.secret-token',
+      'Cookie: SID=session-value; HSID=history-value',
+      'Set-Cookie: VISITOR_INFO1_LIVE=visitor; Path=/',
+      'x-goog-visitor-id: Cgt2aXNpdG9y',
+      'warn yt-dlp header Authorization: Bearer inline-token',
+      'yt-dlp --cookies /Users/kyle/cookies.txt --cookies-from-browser chrome:Profile 1',
+      'yt-dlp --cookies=/tmp/ytdlp-cookies.txt --cookies-from-browser=firefox:default',
+    ].join('\n'),
+  );
+
+  assert.match(masked, /Authorization: <redacted>/);
+  assert.match(masked, /Cookie: <redacted>/);
+  assert.match(masked, /Set-Cookie: <redacted>/);
+  assert.match(masked, /x-goog-visitor-id: <redacted>/i);
+  assert.match(masked, /--cookies <redacted>/);
+  assert.match(masked, /--cookies=<redacted>/);
+  assert.match(masked, /--cookies-from-browser <redacted>/);
+  assert.match(masked, /--cookies-from-browser=<redacted>/);
+  assert.doesNotMatch(masked, /ya29/);
+  assert.doesNotMatch(masked, /inline-token/);
+  assert.doesNotMatch(masked, /session-value/);
+  assert.doesNotMatch(masked, /cookies\.txt/);
+  assert.doesNotMatch(masked, /firefox:default/);
+});
+
+test('maskUsernamesInLogText redacts URL credentials and sensitive query values', () => {
+  const masked = maskUsernamesInLogText(
+    [
+      'GET https://alice:secret@example.test/watch?v=abc&access_token=tok123&api_key=key456',
+      'stream https://video.example.test/file.m3u8?signature=sig789&expire=1777777777',
+      'callback subminer://anilist-setup?access_token=ani-token&state=ok',
+      'json {"password":"hunter2","refreshToken":"refresh-token","client_secret":"client-secret"}',
+    ].join('\n'),
+  );
+
+  assert.match(masked, /https:\/\/<credentials>@example\.test/);
+  assert.match(masked, /access_token=<redacted>/);
+  assert.match(masked, /api_key=<redacted>/);
+  assert.match(masked, /signature=<redacted>/);
+  assert.match(masked, /"password":"<redacted>"/);
+  assert.match(masked, /"refreshToken":"<redacted>"/);
+  assert.match(masked, /"client_secret":"<redacted>"/);
+  assert.doesNotMatch(masked, /alice:secret/);
+  assert.doesNotMatch(masked, /tok123/);
+  assert.doesNotMatch(masked, /key456/);
+  assert.doesNotMatch(masked, /sig789/);
+  assert.doesNotMatch(masked, /ani-token/);
+  assert.doesNotMatch(masked, /hunter2/);
+  assert.match(masked, /state=ok/);
+});
+
 test('exportLogsArchive exports current-day logs and masks usernames', () => {
   const root = makeTempDir();
   const logsDir = path.join(root, 'logs');
@@ -152,6 +240,43 @@ test('exportLogsArchive ignores older dated logs when current-day dated logs exi
   }
 });
 
+test('exportLogsArchive ranks dated fallback logs by local day freshness', () => {
+  withTimeZone('America/Los_Angeles', () => {
+    const root = makeTempDir();
+    const logsDir = path.join(root, 'logs');
+    fs.mkdirSync(logsDir, { recursive: true });
+
+    try {
+      const datedLog = writeLog(
+        logsDir,
+        'app-2026-05-25.log',
+        'dated local-day log\n',
+        '2026-05-25T12:00:00Z',
+      );
+      writeLog(
+        logsDir,
+        'app-2026-05-undated.log',
+        'undated touched before local midnight\n',
+        '2026-05-26T01:00:00Z',
+      );
+
+      const result = exportLogsArchive({
+        logsDir,
+        outputDir: root,
+        now: new Date('2026-05-27T16:00:00.000Z'),
+      });
+
+      assert.equal(result.mode, 'most-recent');
+      assert.deepEqual(result.exportedFiles, [datedLog]);
+
+      const entries = readStoredZipEntries(result.zipPath);
+      assert.deepEqual([...entries.keys()], ['logs/app-2026-05-25.log']);
+    } finally {
+      cleanupDir(root);
+    }
+  });
+});
+
 test('exportLogsArchive falls back to newest log per kind', () => {
   const root = makeTempDir();
   const logsDir = path.join(root, 'logs');
diff --git a/src/main/runtime/log-export.ts b/src/main/runtime/log-export.ts
index 302857d7..25fca4af 100644
--- a/src/main/runtime/log-export.ts
+++ b/src/main/runtime/log-export.ts
@@ -1,8 +1,9 @@
 import * as fs from 'fs';
 import * as os from 'os';
 import * as path from 'path';
-import { resolveLogBaseDir } from '../../shared/log-files';
+import { localDateKey, resolveLogBaseDir } from '../../shared/log-files';
 import { writeStoredZip } from '../../shared/stored-zip';
+import { redactLogExportText } from './log-redaction';
 
 type LogCandidate = {
   path: string;
@@ -29,16 +30,10 @@ export type ExportLogsOptions = {
   now?: Date;
 };
 
-const REDACTED_USER = '<user>';
-
 function pad(value: number): string {
   return String(value).padStart(2, '0');
 }
 
-function localDateKey(date: Date): string {
-  return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}`;
-}
-
 function localWeekKey(date: Date): string {
   const startOfYear = new Date(date.getFullYear(), 0, 1);
   const dayOfYear =
@@ -126,17 +121,41 @@ function selectMostRecentPerKind(candidates: LogCandidate[]): LogCandidate[] {
   return [...byKind.values()].sort((left, right) => left.name.localeCompare(right.name));
 }
 
+function localDateEndMs(dateKey: string): number | null {
+  const match = dateKey.match(/^(\d{4})-(\d{2})-(\d{2})$/);
+  if (!match) return null;
+
+  const year = Number(match[1]);
+  const month = Number(match[2]);
+  const day = Number(match[3]);
+  const date = new Date(year, month - 1, day, 23, 59, 59, 999);
+  if (
+    Number.isNaN(date.getTime()) ||
+    date.getFullYear() !== year ||
+    date.getMonth() !== month - 1 ||
+    date.getDate() !== day
+  ) {
+    return null;
+  }
+  return date.getTime();
+}
+
+function localWeekEndMs(weekKey: string): number | null {
+  const match = weekKey.match(/^(\d{4})-W(\d{2})$/);
+  if (!match) return null;
+
+  const year = Number(match[1]);
+  const week = Number(match[2]);
+  const date = new Date(year, 0, week * 7, 23, 59, 59, 999);
+  return Number.isNaN(date.getTime()) ? null : date.getTime();
+}
+
 function candidateFreshnessMs(candidate: LogCandidate): number {
   if (candidate.fileDateKey) {
-    return Date.parse(`${candidate.fileDateKey}T23:59:59.999Z`);
+    return localDateEndMs(candidate.fileDateKey) ?? candidate.mtimeMs;
   }
   if (candidate.fileWeekKey) {
-    const match = candidate.fileWeekKey.match(/^(\d{4})-W(\d{2})$/);
-    if (match) {
-      const year = Number(match[1]);
-      const week = Number(match[2]);
-      return Date.UTC(year, 0, week * 7, 23, 59, 59, 999);
-    }
+    return localWeekEndMs(candidate.fileWeekKey) ?? candidate.mtimeMs;
   }
   return candidate.mtimeMs;
 }
@@ -167,9 +186,7 @@ function selectLogCandidates(
 }
 
 export function maskUsernamesInLogText(text: string): string {
-  return text
-    .replace(/(\/(?:home|Users)\/)([^/\r\n]+)(?=\/|$)/g, `$1${REDACTED_USER}`)
-    .replace(/([A-Za-z]:[\\/]+Users[\\/]+)([^\\/:\r\n]+)(?=[\\/]|$)/g, `$1${REDACTED_USER}`);
+  return redactLogExportText(text);
 }
 
 export function exportLogsArchive(options: ExportLogsOptions = {}): ExportLogsResult {
diff --git a/src/main/runtime/log-redaction.test.ts b/src/main/runtime/log-redaction.test.ts
new file mode 100644
index 00000000..bd71a387
--- /dev/null
+++ b/src/main/runtime/log-redaction.test.ts
@@ -0,0 +1,137 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { LOG_EXPORT_REDACTION_RULES, redactLogExportText } from './log-redaction';
+
+test('log export redaction rules expose auditable fixtures', () => {
+  assert.deepEqual(
+    LOG_EXPORT_REDACTION_RULES.map((rule) => rule.name),
+    [
+      'signed-youtube-media-url-query',
+      'url-sensitive-components',
+      'sensitive-headers',
+      'yt-dlp-cookie-args',
+      'json-secret-values',
+      'generic-sensitive-key-values',
+      'home-path-usernames',
+      'email-addresses',
+      'ip-addresses',
+    ],
+  );
+
+  const names = new Set<string>();
+  for (const rule of LOG_EXPORT_REDACTION_RULES) {
+    assert.equal(names.has(rule.name), false, `duplicate rule name: ${rule.name}`);
+    names.add(rule.name);
+    assert.ok(rule.pattern.length > 0, `${rule.name} pattern`);
+    assert.ok(rule.replacement.length > 0, `${rule.name} replacement`);
+    assert.ok(rule.risk.length > 0, `${rule.name} risk`);
+    assert.ok(rule.examples.length > 0, `${rule.name} examples`);
+
+    for (const example of rule.examples) {
+      assert.equal(rule.redact(example.input), example.expected, `${rule.name} direct`);
+      assert.equal(redactLogExportText(example.input), example.expected, rule.name);
+    }
+  }
+});
+
+test('redactLogExportText redacts parsed URL query values without swallowing punctuation', () => {
+  const masked = redactLogExportText(
+    [
+      'failed URL (https://example.test/watch?access_token=tok123).',
+      'callback subminer://anilist-setup?access_token=ani-token&state=ok',
+      'encoded https://example.test/watch?client%5Fsecret=secret-value&plain=ok!',
+    ].join('\n'),
+  );
+
+  assert.match(masked, /\(https:\/\/example\.test\/watch\?access_token=<redacted>\)\./);
+  assert.match(masked, /subminer:\/\/anilist-setup\?access_token=<redacted>&state=ok/);
+  assert.match(masked, /client%5Fsecret=<redacted>&plain=ok!/);
+  assert.doesNotMatch(masked, /tok123/);
+  assert.doesNotMatch(masked, /ani-token/);
+  assert.doesNotMatch(masked, /secret-value/);
+});
+
+test('redactLogExportText redacts URL credentials containing at signs', () => {
+  const masked = redactLogExportText('GET https://alice:p@ss@example.test/watch?state=ok');
+
+  assert.equal(masked, 'GET https://<credentials>@example.test/watch?state=ok');
+  assert.doesNotMatch(masked, /alice/);
+  assert.doesNotMatch(masked, /p@ss/);
+});
+
+test('redactLogExportText redacts signed YouTube media URL query strings', () => {
+  const masked = redactLogExportText(
+    [
+      'ffmpeg failed for (https://rr1---sn-a5mekn6r.googlevideo.com/videoplayback?expire=1777777777&ei=EI_VALUE&id=o-SECRETID&itag=251&ip=203.0.113.42&source=youtube&requiressl=yes&n=NSECRET&sparams=expire,ei,ip,id,itag,source,requiressl&sig=SIGSECRET&lsig=LSIGSECRET).',
+      'manifest https://manifest.googlevideo.com/videoplayback?expire=1777777777&signature=SIG2#frag',
+    ].join('\n'),
+  );
+
+  assert.match(
+    masked,
+    /\(https:\/\/rr1---sn-a5mekn6r\.googlevideo\.com\/videoplayback\?<redacted>\)\./,
+  );
+  assert.match(masked, /https:\/\/manifest\.googlevideo\.com\/videoplayback\?<redacted>#frag/);
+  assert.doesNotMatch(masked, /1777777777/);
+  assert.doesNotMatch(masked, /EI_VALUE/);
+  assert.doesNotMatch(masked, /o-SECRETID/);
+  assert.doesNotMatch(masked, /203\.0\.113\.42/);
+  assert.doesNotMatch(masked, /NSECRET/);
+  assert.doesNotMatch(masked, /SIGSECRET/);
+  assert.doesNotMatch(masked, /LSIGSECRET/);
+});
+
+test('redactLogExportText redacts nested JSON secret values', () => {
+  const masked = redactLogExportText(
+    'json {"nested":{"token":123,"safe":"ok"},"items":[{"password":true},{"client_secret":null}]}',
+  );
+
+  assert.match(masked, /"token":"<redacted>"/);
+  assert.match(masked, /"safe":"ok"/);
+  assert.match(masked, /"password":"<redacted>"/);
+  assert.match(masked, /"client_secret":"<redacted>"/);
+  assert.doesNotMatch(masked, /123/);
+  assert.doesNotMatch(masked, /true/);
+  assert.doesNotMatch(masked, /null/);
+});
+
+test('redactLogExportText redacts compound secret keys', () => {
+  const masked = redactLogExportText(
+    [
+      'json {"openaiApiKey":"sk-secret","google_api_key":"AIza-secret","userPassword":"hunter2","safe":"ok"}',
+      'openaiApiKey=sk-inline google_api_key=AIza-inline userPassword=hunter-inline',
+    ].join('\n'),
+  );
+
+  assert.match(masked, /"openaiApiKey":"<redacted>"/);
+  assert.match(masked, /"google_api_key":"<redacted>"/);
+  assert.match(masked, /"userPassword":"<redacted>"/);
+  assert.match(masked, /"safe":"ok"/);
+  assert.match(masked, /openaiApiKey=<redacted>/);
+  assert.match(masked, /google_api_key=<redacted>/);
+  assert.match(masked, /userPassword=<redacted>/);
+  assert.doesNotMatch(masked, /sk-secret|AIza-secret|hunter2/);
+  assert.doesNotMatch(masked, /sk-inline|AIza-inline|hunter-inline/);
+});
+
+test('redactLogExportText redacts quoted secret values containing the opposite quote', () => {
+  const masked = redactLogExportText(`"password":"pa'ss" 'token':'to"ken' "safe":"pa'ss"`);
+
+  assert.equal(masked, `"password":"<redacted>" 'token':'<redacted>' "safe":"pa'ss"`);
+});
+
+test('redactLogExportText redacts IPv6 addresses with zone identifiers', () => {
+  const masked = redactLogExportText('connected [fe80::1%en0]:443 and fe80::2%eth0');
+
+  assert.equal(masked, 'connected [<ip>]:443 and <ip>');
+});
+
+test('redactLogExportText keeps malformed JSON scans bounded', () => {
+  const malformedLine = `${'{'.repeat(70 * 1024)} token=secret`;
+  const masked = redactLogExportText(`${malformedLine}\njson {"token":"secret","safe":"ok"}`);
+
+  assert.match(masked, /token=<redacted>/);
+  assert.match(masked, /json {"token":"<redacted>","safe":"ok"}/);
+  assert.doesNotMatch(masked, /token=secret/);
+  assert.doesNotMatch(masked, /"token":"secret"/);
+});
diff --git a/src/main/runtime/log-redaction.ts b/src/main/runtime/log-redaction.ts
new file mode 100644
index 00000000..190cc16c
--- /dev/null
+++ b/src/main/runtime/log-redaction.ts
@@ -0,0 +1,522 @@
+import * as net from 'net';
+
+type LogRedactionExample = {
+  input: string;
+  expected: string;
+};
+
+export type LogRedactionRule = {
+  name: string;
+  pattern: string;
+  replacement: string;
+  risk: 'pii' | 'secret' | 'pii-or-secret';
+  examples: readonly LogRedactionExample[];
+  redact: (text: string) => string;
+};
+
+const REDACTED_USER = '<user>';
+const REDACTED_VALUE = '<redacted>';
+const REDACTED_CREDENTIALS = '<credentials>';
+const REDACTED_EMAIL = '<email>';
+const REDACTED_IP = '<ip>';
+const MAX_JSON_CANDIDATE_SCAN_CHARS = 64 * 1024;
+
+const SENSITIVE_HEADER_NAMES = [
+  'api-key',
+  'authorization',
+  'cookie',
+  'proxy-authorization',
+  'set-cookie',
+  'x-api-key',
+  'x-emby-token',
+  'x-goog-visitor-id',
+  'x-mediabrowser-token',
+].join('|');
+
+const SENSITIVE_VALUE_KEY_PATTERNS = [
+  'access[_-]?token',
+  'api[_-]?key',
+  'apikey',
+  'authorization',
+  'client[_-]?secret',
+  'cookie',
+  'cookies',
+  'id[_-]?token',
+  'password',
+  'passwd',
+  'pwd',
+  'refresh[_-]?token',
+  'secret',
+  'session',
+  'sid',
+  'sig',
+  'signature',
+  'token',
+].join('|');
+
+const SENSITIVE_VALUE_KEY_SEQUENCES: readonly (readonly string[])[] = [
+  ['access', 'token'],
+  ['api', 'key'],
+  ['apikey'],
+  ['authorization'],
+  ['client', 'secret'],
+  ['cookie'],
+  ['cookies'],
+  ['id', 'token'],
+  ['password'],
+  ['passwd'],
+  ['pwd'],
+  ['refresh', 'token'],
+  ['secret'],
+  ['session'],
+  ['sid'],
+  ['sig'],
+  ['signature'],
+  ['token'],
+];
+const SENSITIVE_NORMALIZED_KEY_SUFFIXES = [
+  'accesstoken',
+  'apikey',
+  'authorization',
+  'clientsecret',
+  'cookie',
+  'cookies',
+  'idtoken',
+  'password',
+  'passwd',
+  'pwd',
+  'refreshtoken',
+  'secret',
+  'session',
+  'signature',
+  'token',
+] as const;
+const SENSITIVE_HEADER_RE = new RegExp(
+  `(^|\\r?\\n)(\\s*(?:${SENSITIVE_HEADER_NAMES})\\s*:\\s*)[^\\r\\n]*`,
+  'gi',
+);
+const SENSITIVE_INLINE_HEADER_RE = new RegExp(
+  `\\b((?:${SENSITIVE_HEADER_NAMES})\\s*:\\s*)[^\\r\\n]*`,
+  'gi',
+);
+const KEY_VALUE_NAME_PATTERN = '[A-Za-z0-9][A-Za-z0-9_.%-]*';
+const SENSITIVE_QUOTED_VALUE_RE = new RegExp(
+  `(["'])(${KEY_VALUE_NAME_PATTERN})\\1(\\s*[:=]\\s*)(["'])((?:(?!\\4)[^\\r\\n])*)\\4`,
+  'g',
+);
+const SENSITIVE_UNQUOTED_VALUE_RE = new RegExp(
+  `\\b(${KEY_VALUE_NAME_PATTERN})(\\s*[:=]\\s*)(?:"[^"\\r\\n]*"|'[^'\\r\\n]*'|[^\\s,}\\]\\)&<>"']+)`,
+  'g',
+);
+const YTDLP_COOKIE_EQUALS_RE =
+  /(--(?:cookies|cookies-from-browser)=)(?:"[^"\r\n]*"|'[^'\r\n]*'|[^\s\r\n]+)/gi;
+const YTDLP_COOKIE_SPACE_RE =
+  /(--(?:cookies|cookies-from-browser)\s+)(?:"[^"\r\n]*"|'[^'\r\n]*'|[^\r\n]*?)(?=\s+--[A-Za-z0-9][A-Za-z0-9-]*|\r?\n|$)/gi;
+const URL_TOKEN_RE = /\b[a-z][a-z0-9+.-]*:\/\/[^\s"'<>]+/gi;
+const URL_CREDENTIALS_RE = /\b([a-z][a-z0-9+.-]*:\/\/)([^/?#\s"'<>]*@)/gi;
+const URL_QUERY_PAIR_RE = /([?&;]|&amp;)([^=&#;]+)=([^&#;]*)/gi;
+const TRAILING_URL_PUNCTUATION_RE = /[)\].,;:!?]+$/;
+const EMAIL_RE = /[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}/gi;
+const BRACKETED_IP_RE = /\[([0-9A-F:.]+(?:%[A-Z0-9_.~-]+)?)\]/gi;
+const IPV4_RE = /(^|[^A-Za-z0-9_.-])((?:\d{1,3}\.){3}\d{1,3})(?![A-Za-z0-9_.-])/g;
+const IPV6_RE =
+  /(^|[^A-Za-z0-9_.-])([0-9A-F]{0,4}:[0-9A-F:.]*(?:%[A-Z0-9_.~-]+)?)(?![A-Za-z0-9_.-])/gi;
+
+function safeDecodeFormComponent(value: string): string {
+  try {
+    return decodeURIComponent(value.replace(/\+/g, ' '));
+  } catch {
+    return value;
+  }
+}
+
+function tokenizeValueKey(key: string): string[] {
+  return (
+    key
+      .replace(/([A-Z]+)([A-Z][a-z])/g, '$1 $2')
+      .replace(/([a-z0-9])([A-Z])/g, '$1 $2')
+      .toLowerCase()
+      .match(/[a-z0-9]+/g) ?? []
+  );
+}
+
+function containsTokenSequence(tokens: readonly string[], sequence: readonly string[]): boolean {
+  for (let index = 0; index <= tokens.length - sequence.length; index += 1) {
+    if (sequence.every((token, offset) => tokens[index + offset] === token)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+function isSensitiveValueKey(key: string): boolean {
+  const decoded = safeDecodeFormComponent(key);
+  const tokens = tokenizeValueKey(decoded);
+  if (SENSITIVE_VALUE_KEY_SEQUENCES.some((sequence) => containsTokenSequence(tokens, sequence))) {
+    return true;
+  }
+
+  const normalized = tokens.join('');
+  return SENSITIVE_NORMALIZED_KEY_SUFFIXES.some((suffix) => normalized.endsWith(suffix));
+}
+
+function splitTrailingUrlPunctuation(token: string): { core: string; trailing: string } {
+  const match = token.match(TRAILING_URL_PUNCTUATION_RE);
+  if (!match) return { core: token, trailing: '' };
+  return {
+    core: token.slice(0, -match[0].length),
+    trailing: match[0],
+  };
+}
+
+function redactSensitiveUrlQueryPairs(rawUrl: string): string {
+  const queryStart = rawUrl.indexOf('?');
+  if (queryStart === -1) return rawUrl;
+
+  const hashStart = rawUrl.indexOf('#', queryStart);
+  const queryEnd = hashStart === -1 ? rawUrl.length : hashStart;
+  const query = rawUrl.slice(queryStart, queryEnd);
+  const redactedQuery = query.replace(URL_QUERY_PAIR_RE, (match, prefix: string, rawKey: string) =>
+    isSensitiveValueKey(rawKey) ? `${prefix}${rawKey}=${REDACTED_VALUE}` : match,
+  );
+
+  return `${rawUrl.slice(0, queryStart)}${redactedQuery}${rawUrl.slice(queryEnd)}`;
+}
+
+function redactUrlToken(token: string): string {
+  const { core, trailing } = splitTrailingUrlPunctuation(token);
+  try {
+    new URL(core);
+  } catch {
+    return token;
+  }
+
+  const withoutCredentials = core.replace(URL_CREDENTIALS_RE, `$1${REDACTED_CREDENTIALS}@`);
+  return `${redactSensitiveUrlQueryPairs(withoutCredentials)}${trailing}`;
+}
+
+function redactUrlSensitiveComponents(text: string): string {
+  return text.replace(URL_TOKEN_RE, (token: string) => redactUrlToken(token));
+}
+
+function isGoogleVideoHost(hostname: string): boolean {
+  const normalized = hostname.toLowerCase();
+  return normalized === 'googlevideo.com' || normalized.endsWith('.googlevideo.com');
+}
+
+function isSignedYouTubeMediaUrl(url: URL): boolean {
+  return isGoogleVideoHost(url.hostname) && url.pathname === '/videoplayback' && url.search !== '';
+}
+
+function redactSignedYouTubeMediaUrlToken(token: string): string {
+  const { core, trailing } = splitTrailingUrlPunctuation(token);
+  let parsed: URL;
+  try {
+    parsed = new URL(core);
+  } catch {
+    return token;
+  }
+
+  if (!isSignedYouTubeMediaUrl(parsed)) return token;
+
+  const queryStart = core.indexOf('?');
+  const hashStart = core.indexOf('#', queryStart);
+  if (queryStart === -1) return token;
+
+  const hash = hashStart === -1 ? '' : core.slice(hashStart);
+  return `${core.slice(0, queryStart)}?${REDACTED_VALUE}${hash}${trailing}`;
+}
+
+function redactSignedYouTubeMediaUrlQueries(text: string): string {
+  return text.replace(URL_TOKEN_RE, (token: string) => redactSignedYouTubeMediaUrlToken(token));
+}
+
+function redactSensitiveHeaders(text: string): string {
+  return text
+    .replace(
+      SENSITIVE_HEADER_RE,
+      (_match, lineStart: string, headerPrefix: string) =>
+        `${lineStart}${headerPrefix}${REDACTED_VALUE}`,
+    )
+    .replace(
+      SENSITIVE_INLINE_HEADER_RE,
+      (_match, headerPrefix: string) => `${headerPrefix}${REDACTED_VALUE}`,
+    );
+}
+
+function redactYtDlpCookieArgs(text: string): string {
+  return text
+    .replace(YTDLP_COOKIE_EQUALS_RE, `$1${REDACTED_VALUE}`)
+    .replace(YTDLP_COOKIE_SPACE_RE, `$1${REDACTED_VALUE}`);
+}
+
+function findJsonScanEnd(text: string, start: number): number {
+  const boundedEnd = Math.min(text.length, start + MAX_JSON_CANDIDATE_SCAN_CHARS);
+  const newline = text.indexOf('\n', start);
+  if (newline !== -1 && newline < boundedEnd) return newline;
+  return boundedEnd;
+}
+
+function findJsonEnd(text: string, start: number, endExclusive: number): number {
+  const stack: string[] = [];
+  let inString = false;
+  let quote = '';
+  let escaped = false;
+
+  for (let index = start; index < endExclusive; index += 1) {
+    const char = text[index];
+
+    if (inString) {
+      if (escaped) {
+        escaped = false;
+      } else if (char === '\\') {
+        escaped = true;
+      } else if (char === quote) {
+        inString = false;
+      }
+      continue;
+    }
+
+    if (char === '"' || char === "'") {
+      inString = true;
+      quote = char;
+      continue;
+    }
+
+    if (char === '{') {
+      stack.push('}');
+    } else if (char === '[') {
+      stack.push(']');
+    } else if (char === '}' || char === ']') {
+      if (stack.pop() !== char) return -1;
+      if (stack.length === 0) return index;
+    }
+  }
+
+  return -1;
+}
+
+function redactJsonValue(value: unknown): unknown {
+  if (Array.isArray(value)) {
+    return value.map((entry) => redactJsonValue(entry));
+  }
+
+  if (value && typeof value === 'object') {
+    const redacted: Record<string, unknown> = {};
+    for (const [key, entry] of Object.entries(value)) {
+      redacted[key] = isSensitiveValueKey(key) ? REDACTED_VALUE : redactJsonValue(entry);
+    }
+    return redacted;
+  }
+
+  return value;
+}
+
+function redactJsonPayloads(text: string): string {
+  let output = '';
+  let cursor = 0;
+
+  for (let index = 0; index < text.length; index += 1) {
+    const char = text[index];
+    if (char !== '{' && char !== '[') continue;
+
+    const scanEnd = findJsonScanEnd(text, index);
+    const end = findJsonEnd(text, index, scanEnd);
+    if (end === -1) {
+      index = Math.max(index, scanEnd - 1);
+      continue;
+    }
+
+    const candidate = text.slice(index, end + 1);
+    try {
+      const parsed = JSON.parse(candidate);
+      output += text.slice(cursor, index);
+      output += JSON.stringify(redactJsonValue(parsed));
+      cursor = end + 1;
+      index = end;
+    } catch {
+      // Non-JSON brace pairs remain available to the fallback key-value rules.
+    }
+  }
+
+  return `${output}${text.slice(cursor)}`;
+}
+
+function redactSensitiveKeyValues(text: string): string {
+  return text
+    .replace(
+      SENSITIVE_QUOTED_VALUE_RE,
+      (match, keyQuote: string, key: string, separator: string, valueQuote: string) =>
+        isSensitiveValueKey(key)
+          ? `${keyQuote}${key}${keyQuote}${separator}${valueQuote}${REDACTED_VALUE}${valueQuote}`
+          : match,
+    )
+    .replace(SENSITIVE_UNQUOTED_VALUE_RE, (match, key: string, separator: string) => {
+      if (!isSensitiveValueKey(key)) return match;
+      const value = match.slice(key.length + separator.length);
+      const quote = value[0];
+      if (quote === '"' || quote === "'") {
+        return `${key}${separator}${quote}${REDACTED_VALUE}${quote}`;
+      }
+      return `${key}${separator}${REDACTED_VALUE}`;
+    });
+}
+
+function redactHomePathUsernames(text: string): string {
+  return text
+    .replace(/(\/(?:home|Users)\/)([^/\r\n]+)(?=\/|$)/g, `$1${REDACTED_USER}`)
+    .replace(/([A-Za-z]:[\\/]+Users[\\/]+)([^\\/:\r\n]+)(?=[\\/]|$)/g, `$1${REDACTED_USER}`);
+}
+
+function normalizeIpCandidate(candidate: string): string {
+  return candidate.split('%', 1)[0] ?? candidate;
+}
+
+function isIpAddress(candidate: string): boolean {
+  return net.isIP(normalizeIpCandidate(candidate)) !== 0;
+}
+
+function redactIpAddresses(text: string): string {
+  return text
+    .replace(BRACKETED_IP_RE, (match, candidate: string) =>
+      isIpAddress(candidate) ? `[${REDACTED_IP}]` : match,
+    )
+    .replace(IPV4_RE, (match, prefix: string, candidate: string) =>
+      net.isIP(candidate) === 4 ? `${prefix}${REDACTED_IP}` : match,
+    )
+    .replace(IPV6_RE, (match, prefix: string, candidate: string) =>
+      net.isIP(normalizeIpCandidate(candidate)) === 6 ? `${prefix}${REDACTED_IP}` : match,
+    );
+}
+
+export const LOG_EXPORT_REDACTION_RULES: readonly LogRedactionRule[] = [
+  {
+    name: 'signed-youtube-media-url-query',
+    pattern: '*.googlevideo.com/videoplayback query strings',
+    replacement: REDACTED_VALUE,
+    risk: 'pii-or-secret',
+    examples: [
+      {
+        input: 'https://rr1---sn.example.googlevideo.com/videoplayback?expire=1&sig=secret',
+        expected: `https://rr1---sn.example.googlevideo.com/videoplayback?${REDACTED_VALUE}`,
+      },
+    ],
+    redact: redactSignedYouTubeMediaUrlQueries,
+  },
+  {
+    name: 'url-sensitive-components',
+    pattern: 'URL tokens with credentials or sensitive query params',
+    replacement: `${REDACTED_CREDENTIALS}, ${REDACTED_VALUE}`,
+    risk: 'pii-or-secret',
+    examples: [
+      {
+        input: 'GET https://alice:secret@example.test/watch?access_token=tok123&state=ok',
+        expected: `GET https://${REDACTED_CREDENTIALS}@example.test/watch?access_token=${REDACTED_VALUE}&state=ok`,
+      },
+    ],
+    redact: redactUrlSensitiveComponents,
+  },
+  {
+    name: 'sensitive-headers',
+    pattern: `headers: ${SENSITIVE_HEADER_NAMES}`,
+    replacement: REDACTED_VALUE,
+    risk: 'secret',
+    examples: [
+      {
+        input: 'Authorization: Bearer token',
+        expected: `Authorization: ${REDACTED_VALUE}`,
+      },
+    ],
+    redact: redactSensitiveHeaders,
+  },
+  {
+    name: 'yt-dlp-cookie-args',
+    pattern: '--cookies and --cookies-from-browser arguments',
+    replacement: REDACTED_VALUE,
+    risk: 'secret',
+    examples: [
+      {
+        input: 'yt-dlp --cookies /Users/kyle/cookies.txt --verbose',
+        expected: `yt-dlp --cookies ${REDACTED_VALUE} --verbose`,
+      },
+    ],
+    redact: redactYtDlpCookieArgs,
+  },
+  {
+    name: 'json-secret-values',
+    pattern: `JSON object keys: ${SENSITIVE_VALUE_KEY_PATTERNS}`,
+    replacement: REDACTED_VALUE,
+    risk: 'secret',
+    examples: [
+      {
+        input: 'json {"token":123,"safe":"ok"}',
+        expected: `json {"token":"${REDACTED_VALUE}","safe":"ok"}`,
+      },
+      {
+        input: 'json {"openaiApiKey":"sk-secret","safe":"ok"}',
+        expected: `json {"openaiApiKey":"${REDACTED_VALUE}","safe":"ok"}`,
+      },
+    ],
+    redact: redactJsonPayloads,
+  },
+  {
+    name: 'generic-sensitive-key-values',
+    pattern: `key-value pairs: ${SENSITIVE_VALUE_KEY_PATTERNS}`,
+    replacement: REDACTED_VALUE,
+    risk: 'secret',
+    examples: [
+      {
+        input: 'refreshToken=abc123 state=ok',
+        expected: `refreshToken=${REDACTED_VALUE} state=ok`,
+      },
+      {
+        input: 'google_api_key=AIza-secret userPassword=hunter2',
+        expected: `google_api_key=${REDACTED_VALUE} userPassword=${REDACTED_VALUE}`,
+      },
+    ],
+    redact: redactSensitiveKeyValues,
+  },
+  {
+    name: 'home-path-usernames',
+    pattern: 'Linux, macOS, and Windows home paths',
+    replacement: REDACTED_USER,
+    risk: 'pii',
+    examples: [
+      {
+        input: '/Users/kyle/Library/Application Support/SubMiner',
+        expected: `/Users/${REDACTED_USER}/Library/Application Support/SubMiner`,
+      },
+    ],
+    redact: redactHomePathUsernames,
+  },
+  {
+    name: 'email-addresses',
+    pattern: 'email-like addresses',
+    replacement: REDACTED_EMAIL,
+    risk: 'pii',
+    examples: [
+      {
+        input: 'support kyle@example.test',
+        expected: `support ${REDACTED_EMAIL}`,
+      },
+    ],
+    redact: (text) => text.replace(EMAIL_RE, REDACTED_EMAIL),
+  },
+  {
+    name: 'ip-addresses',
+    pattern: 'IPv4, bracketed IPv6, and bare IPv6 candidates validated with net.isIP',
+    replacement: REDACTED_IP,
+    risk: 'pii',
+    examples: [
+      {
+        input: 'remote addr [2001:db8::1234]:443 and 203.0.113.42',
+        expected: `remote addr [${REDACTED_IP}]:443 and ${REDACTED_IP}`,
+      },
+    ],
+    redact: redactIpAddresses,
+  },
+];
+
+export function redactLogExportText(text: string): string {
+  return LOG_EXPORT_REDACTION_RULES.reduce((redacted, rule) => rule.redact(redacted), text);
+}
diff --git a/src/shared/log-files.test.ts b/src/shared/log-files.test.ts
index 1441ae2a..1e5ee2e7 100644
--- a/src/shared/log-files.test.ts
+++ b/src/shared/log-files.test.ts
@@ -12,6 +12,45 @@ import {
   resolveDefaultLogFilePath,
 } from './log-files';
 
+function withTimeZone<T>(timeZone: string, run: () => T): T {
+  const previous = process.env.TZ;
+  process.env.TZ = timeZone;
+  try {
+    return run();
+  } finally {
+    if (previous === undefined) {
+      delete process.env.TZ;
+    } else {
+      process.env.TZ = previous;
+    }
+  }
+}
+
+function withMockedNow<T>(isoDate: string, run: () => T): T {
+  const RealDate = Date;
+  const fixedMs = RealDate.parse(isoDate);
+  class FixedDate extends RealDate {
+    constructor(value?: string | number | Date) {
+      if (arguments.length === 0) {
+        super(fixedMs);
+      } else {
+        super(value as string);
+      }
+    }
+
+    static override now(): number {
+      return fixedMs;
+    }
+  }
+
+  globalThis.Date = FixedDate as DateConstructor;
+  try {
+    return run();
+  } finally {
+    globalThis.Date = RealDate;
+  }
+}
+
 test('resolveDefaultLogFilePath uses app prefix by default', () => {
   const now = new Date('2026-03-22T12:00:00.000Z');
   const resolved = resolveDefaultLogFilePath('app', {
@@ -26,6 +65,36 @@ test('resolveDefaultLogFilePath uses app prefix by default', () => {
   );
 });
 
+test('resolveDefaultLogFilePath uses the local date when UTC has advanced', () => {
+  withTimeZone('America/Los_Angeles', () => {
+    const now = new Date('2026-05-26T02:00:00.000Z');
+    assert.equal(now.toISOString().slice(0, 10), '2026-05-26');
+
+    const resolved = resolveDefaultLogFilePath('app', {
+      platform: 'linux',
+      homeDir: '/home/tester',
+      now,
+    });
+
+    assert.equal(
+      resolved,
+      path.join('/home/tester', '.config', 'SubMiner', 'logs', 'app-2026-05-25.log'),
+    );
+  });
+});
+
+test('resolveDefaultLogFilePath rejects invalid dates', () => {
+  assert.throws(
+    () =>
+      resolveDefaultLogFilePath('app', {
+        platform: 'linux',
+        homeDir: '/home/tester',
+        now: new Date('invalid'),
+      }),
+    /Invalid time value/,
+  );
+});
+
 test('resolveDefaultLogFilePath uses daily filenames for mpv logs', () => {
   const now = new Date('2026-03-22T12:00:00.000Z');
   const resolved = resolveDefaultLogFilePath('mpv', {
@@ -91,6 +160,34 @@ test('pruneLogFiles removes logs older than retention window', () => {
   }
 });
 
+test('pruneLogDirectoryForPath deduplicates by local day across UTC midnight', () => {
+  withTimeZone('America/Los_Angeles', () => {
+    const logsDir = fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-log-prune-local-day-'));
+    const logPath = path.join(logsDir, 'app-2026-05-25.log');
+    const firstStalePath = path.join(logsDir, 'app-first-stale.log');
+    const secondStalePath = path.join(logsDir, 'app-second-stale.log');
+    const staleDate = new Date('2026-05-01T12:00:00.000Z');
+
+    try {
+      fs.writeFileSync(firstStalePath, 'stale\n', 'utf8');
+      fs.utimesSync(firstStalePath, staleDate, staleDate);
+
+      withMockedNow('2026-05-25T23:30:00.000Z', () => pruneLogDirectoryForPath(logPath, 7));
+
+      assert.equal(fs.existsSync(firstStalePath), false);
+
+      fs.writeFileSync(secondStalePath, 'stale\n', 'utf8');
+      fs.utimesSync(secondStalePath, staleDate, staleDate);
+
+      withMockedNow('2026-05-26T00:30:00.000Z', () => pruneLogDirectoryForPath(logPath, 7));
+
+      assert.equal(fs.existsSync(secondStalePath), true);
+    } finally {
+      fs.rmSync(logsDir, { recursive: true, force: true });
+    }
+  });
+});
+
 test('appendLogLine trims oversized logs to newest bytes', () => {
   const logsDir = fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-log-trim-'));
   const logPath = path.join(logsDir, 'app.log');
diff --git a/src/shared/log-files.ts b/src/shared/log-files.ts
index 19b7f10f..5ca9d848 100644
--- a/src/shared/log-files.ts
+++ b/src/shared/log-files.ts
@@ -36,6 +36,17 @@ function floorDiv(left: number, right: number): number {
   return Math.floor(left / right);
 }
 
+function padDatePart(value: number): string {
+  return String(value).padStart(2, '0');
+}
+
+export function localDateKey(date: Date): string {
+  if (Number.isNaN(date.getTime())) {
+    throw new RangeError('Invalid time value');
+  }
+  return `${date.getFullYear()}-${padDatePart(date.getMonth() + 1)}-${padDatePart(date.getDate())}`;
+}
+
 function daysFromCivil(year: number, month: number, day: number): bigint {
   const adjustedYear = year - (month <= 2 ? 1 : 0);
   const era = floorDiv(adjustedYear >= 0 ? adjustedYear : adjustedYear - 399, 400);
@@ -78,7 +89,7 @@ export function resolveDefaultLogFilePath(
   },
 ): string {
   const now = options?.now ?? new Date();
-  const suffix = now.toISOString().slice(0, 10);
+  const suffix = localDateKey(now);
   return path.join(resolveLogBaseDir(options), 'logs', `${kind}-${suffix}.log`);
 }
 
@@ -167,7 +178,7 @@ export function pruneLogFiles(
 
 function maybePruneLogDirectory(logPath: string, retentionDays: number): void {
   const logsDir = path.dirname(logPath);
-  const key = `${logsDir}:${new Date().toISOString().slice(0, 10)}:${retentionDays}`;
+  const key = `${logsDir}:${localDateKey(new Date())}:${retentionDays}`;
   if (prunedDirectories.has(key)) return;
   pruneLogFiles(logsDir, { retentionDays });
   prunedDirectories.add(key);