Epoch and Unix timestamp converter

Paste a timestamp or a date. You get seconds, milliseconds, the UTC time and the time in the zone you choose.

What you can type

• Seconds since 1970: a number such as 1700000000 (10 digits for dates between 2001 and 2286).
• Milliseconds: 1700000000000 (13 digits), as JavaScript's Date.now() and many APIs give.
• Microseconds and nanoseconds: 16 and 19 digits. The tool guesses the unit from the size of the number and tells you which one it chose.
• A date: 2026-11-13, 2026-11-13 10:20, 2026-11-13T10:20:00Z or with an offset, 2026-11-13T10:20:00+05:30. If the text has no time zone, it is read in the zone chosen in the menu.

Reading the result

The tool shows the same instant in several forms: seconds, milliseconds, the UTC time in ISO 8601 form, and the wall-clock time in your chosen zone with its abbreviation and offset from UTC. If the date you typed falls in the hour that the clocks skip when daylight saving starts, the tool says the time does not exist. If it falls in the hour that happens twice when the clocks go back, it shows the first one and gives the second as a number.

Why timestamps are handy

A timestamp is one number that means the same instant everywhere. It has no time zone, no daylight saving and no date format to argue about, so it is easy to store, compare and subtract. The zone only matters when you show the time to a person.

Common mistakes

1. Mixing seconds and milliseconds. A JavaScript date of the year 55,000 usually means that seconds were treated as milliseconds, and a date in January 1970 means the opposite.
2. Reading a date without a zone in the wrong zone. 2026-11-13 10:20 is a different instant in Kolkata and in London.
3. Forgetting that many systems store timestamps in UTC and convert on display.
4. Assuming a day is always 24 hours. Local days with clock changes have 23 or 25 hours; Unix time itself counts every day as 86,400 seconds.

We compared this converter with Python's datetime and zoneinfo on 900 random timestamps and dates in ten time zones, including zones with half-hour and 45-minute offsets, and the results matched.

This is an independent guide. It is not connected with the IERS, BIPM, IANA, NIST or any company named here. Facts were read on 14 November 2026 from the sources named on each page; calculated values come from Python.