From 0d2dcbfa49568aed96fa6630a39e0406252d9d6d Mon Sep 17 00:00:00 2001
From: Dominic R <dominic@sdko.org>
Date: Mon, 19 Jan 2026 11:03:03 -0500
Subject: [PATCH] web/forms: fix invalid date error for empty datetime-local
 inputs (#19561)

* web/forms: fix invalid date error for empty datetime-local inputs

Overview:

When a datetime-local input is empty, `valueAsNumber` returns `NaN` and `new Date("")` creates an Invalid Date. Previously, form serialization passed these invalid dates to the API, which caused  "RangeError: Invalid time value" when `toISOString()` was called. Now empty datetime inputs correctly serialize to `null`.

Testing:

1. Go to Directory > Tokens and App passwords
2. Create or edit a token
3. Uncheck the "Expiring" checkbox
4. Save the token
5. Verify no error occurs and token is saved without expiry

Motivation:

Closes: https://github.com/goauthentik/authentik/issues/19558

* web: lint
---
 web/src/elements/forms/Form.ts | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/web/src/elements/forms/Form.ts b/web/src/elements/forms/Form.ts
index 47eee9cc06..3d18d095fa 100644
--- a/web/src/elements/forms/Form.ts
+++ b/web/src/elements/forms/Form.ts
@@ -114,9 +114,10 @@ export function serializeForm<T = Record<string, unknown>>(elements: Iterable<AK
             }
 
             if (inputElement.type === "datetime-local") {
+                const valueAsNumber = inputElement.valueAsNumber;
                 return assignValue(
                     inputElement,
-                    dateToUTC(new Date(inputElement.valueAsNumber)),
+                    isNaN(valueAsNumber) ? null : dateToUTC(new Date(valueAsNumber)),
                     json,
                 );
             }
@@ -124,7 +125,12 @@ export function serializeForm<T = Record<string, unknown>>(elements: Iterable<AK
             if ("type" in inputElement.dataset && inputElement.dataset.type === "datetime-local") {
                 // Workaround for Firefox <93, since 92 and older don't support
                 // datetime-local fields
-                return assignValue(inputElement, dateToUTC(new Date(inputElement.value)), json);
+                const date = new Date(inputElement.value);
+                return assignValue(
+                    inputElement,
+                    isNaN(date.getTime()) ? null : dateToUTC(date),
+                    json,
+                );
             }
 
             if (inputElement.type === "checkbox") {