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Unix Timestamp Converter

Convert Unix timestamps and ISO dates with seconds or milliseconds selected explicitly. Display results in UTC and a chosen time zone.

Choose seconds or milliseconds explicitly. Date input uses the selected time zone; nonexistent local times during daylight-saving changes are rejected. Repeated times use the earlier occurrence.

Use an IANA time zone (for example, America/New_York).
Output
0 charactersUTF-8

Input and output examples

Example 1

Input

0 seconds

Output

1970-01-01T00:00:00.000Z

Example 2

Input

1735689600000 milliseconds

Output

2025-01-01T00:00:00.000Z

How to use it

  1. Explicitly choose seconds or milliseconds.
  2. Convert a timestamp to a date or enter a date to create a timestamp.
  3. Review UTC and selected-zone values, then copy what you need.

Frequently asked questions

Are 13-digit numbers automatically milliseconds?

No. You select the unit. A 13-digit number is interpreted as seconds if you choose seconds.

Is zero a valid timestamp?

Yes. Zero seconds is 1970-01-01T00:00:00Z.

Does the selected time zone change the timestamp?

The UTC instant stays the same; only the displayed local date and time change with the selected zone.

Full usage guide: Unix Timestamp Converter