diff --git a/CHANGELOG.md b/CHANGELOG.md
index 19669c3a..9a993b13 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Fixed
+
+- Fixed an issue with the clone functionality of an activity caused by a changed date format
+
 ## 2.104.0 - 2024-08-17
 
 ### Added
diff --git a/libs/common/src/lib/validator-constraints/is-after-1970.ts b/libs/common/src/lib/validator-constraints/is-after-1970.ts
index 3f5b7db0..9dc0b04c 100644
--- a/libs/common/src/lib/validator-constraints/is-after-1970.ts
+++ b/libs/common/src/lib/validator-constraints/is-after-1970.ts
@@ -2,7 +2,7 @@ import {
   ValidatorConstraint,
   ValidatorConstraintInterface
 } from 'class-validator';
-import { format, isAfter, parseISO } from 'date-fns';
+import { format, isAfter } from 'date-fns';
 
 @ValidatorConstraint({ name: 'isAfter1970' })
 export class IsAfter1970Constraint implements ValidatorConstraintInterface {
@@ -10,7 +10,7 @@ export class IsAfter1970Constraint implements ValidatorConstraintInterface {
     return `date must be after ${format(new Date(0), 'yyyy')}`;
   }
 
-  public validate(aDateString: string) {
-    return isAfter(parseISO(aDateString), new Date(0));
+  public validate(aDate: Date) {
+    return isAfter(aDate, new Date(0));
   }
 }