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Admin: clearing an optional datetime field saves "", which fails validation ("Invalid input") #4424
Description
EmDash 1.3.1.
Steps: In the content editor, type a value into an optional datetime field, clear it, then save.
Result: The request sends "field": "". The server validator (zod-generator.ts: z.iso.datetime(...) with .nullish()) rejects it with a VALIDATION_ERROR invalid_union, so the entry can't be saved until the field holds a date again.
Cause: fromDatetimeLocalInputValue in the admin returns "" for an empty input.
Suggested fix: return null when the field isn't required, or have the server treat "" as null for optional datetime fields.
Activity
emdash-autofix commentedon Oct 26, 2026
The EmDash bot's work on this issue continues in #4425.
emdash-autofix commentedon Oct 26, 2026
The fix is ready in PR #4425, and the required checks have passed. Clearing an optional datetime now saves
null, including in repeater sub-fields. Could you confirm that this resolves your original steps when you try the fix?