Epoch Converter
Paste an epoch value — seconds or milliseconds, auto-detected — and get local time, UTC and ISO 8601 in one shot.
Frequently asked questions
How do I know if my epoch is in seconds or milliseconds?
Count the digits: 10 digits = seconds, 13 digits = milliseconds. This converter detects the unit automatically from the magnitude, so you can paste either.
What epoch does Unix time count from?
1 January 1970 00:00:00 UTC — known simply as 'the epoch'. Negative values represent moments before that date.
Does the year 2038 problem affect me?
32-bit systems storing seconds-since-epoch overflow in January 2038. Modern 64-bit systems and JavaScript numbers are unaffected — your converted dates work centuries in both directions.