x.com
Schedule X Post
Input
text requiredThe post's text. X caps this at 280 characters for a standard (non-subscriber) account.
sendAt requiredWhen to send the post, as an ISO-8601 datetime (e.g. "2026-09-15T14:30:00"). X's composer only offers minute precision and reads/writes it in the account's own display timezone, not UTC — pass a naive local time (no offset) matching that timezone. X also refuses times inside the next ~10 minutes and more than ~18 months out.
Output
text requiredsend_at requiredscheduled_id required