From 053a52aec857fe6576fdbc52e47c429a1d8f02d6 Mon Sep 17 00:00:00 2001
From: Daniel Dietzler <36593685+danieldietzler@users.noreply.github.com>
Date: Wed, 8 Jul 2026 21:53:16 +0200
Subject: [PATCH] fix: iso date parsing for three digit years (#29739)

---
 server/src/utils/date.spec.ts | 4 ++++
 server/src/validation.ts      | 8 ++------
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/server/src/utils/date.spec.ts b/server/src/utils/date.spec.ts
index 729b515467..476b5cb526 100644
--- a/server/src/utils/date.spec.ts
+++ b/server/src/utils/date.spec.ts
@@ -14,6 +14,10 @@ describe('asDateString', () => {
     const date = new Date(2000, 0, 15); // 15 Jan 2000, local midnight
     expect(asDateString(date)).toBe('2000-01-15');
   });
+
+  it('should correctly pad years with a leading 0', () => {
+    expect(asDateString(new Date('280-12-12'))).toBe('0280-12-12');
+  });
 });
 
 describe('asDateTimeString', () => {
diff --git a/server/src/validation.ts b/server/src/validation.ts
index 220d89e4a0..419d0cb0dc 100644
--- a/server/src/validation.ts
+++ b/server/src/validation.ts
@@ -1,4 +1,5 @@
 import { ArgumentMetadata, FileValidator, Injectable, ParseUUIDPipe } from '@nestjs/common';
+import { DateTime } from 'luxon';
 import { createZodDto } from 'nestjs-zod';
 import sanitize from 'sanitize-filename';
 import { isIP, isIPRange } from 'validator';
@@ -173,12 +174,7 @@ export const isoDateToDate = z
     z.date(),
     {
       decode: (isoString) => new Date(isoString),
-      encode: (date) => {
-        const y = date.getFullYear();
-        const m = String(date.getMonth() + 1).padStart(2, '0');
-        const d = String(date.getDate()).padStart(2, '0');
-        return `${y}-${m}-${d}`;
-      },
+      encode: (date) => DateTime.fromJSDate(date).toFormat('yyyy-MM-dd'),
     },
   )
   .meta({ example: '2024-01-01' });