Free Online ISO 8601 to Unix Timestamp Converter

Convert ISO 8601 to Unix timestamp instantly, in UTC, with milliseconds detected and a table of well-known timestamps.

Converter

Unix, ISO 8601, SQL, Excel, .NET Ticks & 33 Formats Total

Convert any date/time between timestamp formats, or pick one from a calendar - all in UTC

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Results are provided for informational purposes only and may contain errors. Please verify important information independently. Use of this tool is at your own risk.

How to convert ISO 8601 to Unix timestamp

Convert ISO 8601 to Unix timestamp instantly. Paste a value and see the result in UTC as you type, with the method and a table of well-known timestamps.

  1. Type or paste your ISO 8601 value, such as 2026-01-01T00:00:00Z, into the box above.
  2. The result appears right away: 2026-01-01T00:00:00Z is 1767225600.
  3. Copy the result, or choose from 33 date and time formats in the From and To boxes.

How the conversion works

The converter counts the seconds from 1 January 1970, 00:00:00 UTC to your date. Leap seconds are not counted, as in every Unix system. The date is read as UTC, so a date in your local time zone is off by your UTC offset.

Well-known ISO 8601 values

ISO 8601Unix timestamp
1970-01-01T00:00:00.000Z0
2000-01-01T00:00:00.000Z946684800
2001-09-09T01:46:40.000Z1000000000
2009-02-13T23:31:30.000Z1234567890
2023-11-14T22:13:20.000Z1700000000
2026-01-01T00:00:00.000Z1767225600
2033-05-18T03:33:20.000Z2000000000
2038-01-19T03:14:07.000Z2147483647

ISO 8601 and Unix timestamp explained

ISO 8601 is the international date and time standard, written like 2026-01-01T00:00:00.000Z. The Z means UTC. It is unambiguous and the format most JSON APIs use.

A Unix timestamp counts the seconds since 1 January 1970, 00:00:00 UTC (the Unix epoch). Most programming languages, databases and APIs store time this way.

Frequently asked questions

Is the result in my time zone?

No, every result is in UTC, so it is the same for everyone. To get local time, add your UTC offset, for example +2 hours for Central Europe in summer.

What if my timestamp has 13 digits?

Then it is in milliseconds. The converter reads 13-digit values as milliseconds, 16 digits as microseconds and 19 digits as nanoseconds.

What is the year 2038 problem?

Systems that store Unix time in a signed 32-bit number stop at 2147483647, which is 19 January 2038, 03:14:07 UTC. After that the number overflows. 64-bit systems are not affected.

Is this tool free?

Yes, it's free to use. No signup, no email required. Get results on this page.

How do I get my result?

Use the tool on this page. Your result appears here; no email delivery is required.