Briefle words · Code & architecture
UTC
Coordinated Universal Time, the single global reference clock that systems store and exchange times in before converting to local time.
Say it to an AI
booking.confirmed webhook payload: all timestamps as ISO 8601 strings in UTC with a Z suffix (arrivalAt, createdAt), stay dates as ISO calendar dates (YYYY-MM-DD), plus the hotel's IANA time zone so partners can render local time. No locale-formatted dates anywhere.
How an expert would brief the stronger version of “Booking webhook”.
See it
Try it as a puzzle →A hotel booking platform sends partners a webhook each time a reservation is confirmed.
Why: The trailing Z in A's "2026-03-08T14:30:00Z" means UTC; B's "2:30:00 PM" has no zone, so nobody knows which 2:30 it is.
Related words
Room 5 · APIs & data
Learn “UTC” in a five-minute lesson