diff --git a/packages/backend/src/misc/gen-id.ts b/packages/backend/src/misc/gen-id.ts
index 641182c14..b3a808f0a 100644
--- a/packages/backend/src/misc/gen-id.ts
+++ b/packages/backend/src/misc/gen-id.ts
@@ -7,8 +7,8 @@ import * as crypto from 'node:crypto';
 const TIME2000 = 946684800000;
 let counter = crypto.randomBytes(2).readUInt16LE(0);
 
-export function genId(date?: Date = new Date()): string {
-	let t = Math.min(date, new Date());
+export function genId(date: Date = new Date()): string {
+	let t = Math.min(date.valueOf(), new Date().valueOf());
 	t -= TIME2000;
 	if (t < 0) t = 0;
 	if (isNaN(t)) throw new Error('Failed to create AID: Invalid Date');