UUID Timestamp Decoder
Extract the creation time embedded in a version-1 UUID. (v4 UUIDs are random and carry no time.)
Embedded timestamp (UTC)
Relative
Only version-1 (time-based) UUIDs carry a timestamp. v4 UUIDs are random and have none.
How it works
The tool reassembles the 60-bit time field from the UUID, divides by 10,000 to get milliseconds, and subtracts the 1582 Gregorian epoch offset.
Everything is computed locally in your browser — nothing is uploaded.
Frequently asked questions
Which UUIDs contain a time?
Only version-1 (and the related version-2) UUIDs embed a timestamp — 100-nanosecond intervals since 1582-10-15. Version-4 UUIDs are fully random and have no time.
How accurate is it?
The embedded clock is precise to 100 nanoseconds; this tool shows it to the millisecond.