Date & time converter
Convert between ISO 8601, Unix timestamps, RFC 7231, JS dates and more.
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About the date & time converter
Takes a date in almost any form — Unix seconds, milliseconds, ISO 8601, an HTTP date, even a MongoDB ObjectId — and shows every other representation at once, including the Excel serial number and the reverse DNS style. Leave the field empty to see the current moment.
Frequently asked questions
Seconds or milliseconds?
A ten-digit number is seconds, thirteen digits is milliseconds. This tool detects the difference by length, which is the same heuristic most libraries use and is reliable for any date this century.
Which timezone do the results use?
ISO 8601 output is UTC. The ISO 9075, RFC 3339 and locale rows use your machine's local timezone, and the offset is listed at the bottom so you can tell them apart.