ISO 8601 → Unix timestamp
Paste or pick a datetime that matches an ISO 8601 instant (for example2024-06-15T12:00:00.000Z) and copy the corresponding Unix timestamp for APIs that still want integers.
RFC 3339 compatible
RFC 3339 is a profile of ISO 8601 widely used on the web. Stamply's ISO output uses the Z suffix for unambiguous UTC.