About Unix timestamps
A Unix timestamp is the number of seconds since the Unix epoch (00:00:00 UTC on 1 January 1970). JavaScript usually works with milliseconds (multiply by 1000). The tool auto-detects whether your input is in seconds or milliseconds.
Frequently asked questions
Does it auto-detect seconds vs milliseconds?
Yes. Values below ~1 trillion are treated as Unix seconds; larger values are treated as milliseconds.