Unix time explained
A Unix timestamp counts elapsed time from 00:00:00 UTC on 1 January 1970. Many APIs use seconds, while JavaScript and some databases use milliseconds. This converter detects large millisecond values automatically.
Why do local and UTC times differ?
Local output uses your device time zone. UTC is a universal reference and the ISO value includes its standardized representation.
Does a Unix timestamp contain a time zone?
No. It represents one instant; a time zone is applied only when displaying that instant.