Timestamp Converter
About This Tool
Supports Unix timestamps in seconds (10 digits) and milliseconds (13 digits). You can switch display unit at the top and convert using the chosen unit.
Conversions between date-time and timestamps respect the selected time zone and Daylight Saving Time (DST). The page relies on browser Intl APIs and offset derivation for accurate results.
FAQ
Result differs from expectation?
Check the unit (seconds/milliseconds) and input length; also verify the selected time zone.
How to distinguish seconds vs milliseconds?
10 digits usually mean seconds; 13 digits usually mean milliseconds. The page auto-detects by length, but keep the radio unit consistent.
What does time zone affect?
Timestamps are UTC-based. Time zone affects local display and the conversion from local date-time to UTC when converting to timestamps.
Difference between ISO and GMT strings?
ISO uses standard ISO 8601 (with Z/offset). GMT comes from browser toUTCString, a more human-readable English format.
Does DST change results?
Yes. DST switches alter the offset for some dates; this page accounts for it during conversion.