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How to Convert Timestamp to Date
Learn how Unix timestamps convert to readable dates, with seconds and milliseconds examples.
Updated 2026-05-09
Direct Answer
A Unix timestamp is converted by treating it as time elapsed since 1970-01-01 00:00:00 UTC. Seconds timestamps are usually 10 digits; millisecond timestamps are usually 13 digits.
Steps
Check whether the timestamp is in seconds or milliseconds, convert it to a date object, then display it as UTC or local time.
- 10 digits usually means seconds
- 13 digits usually means milliseconds
- UTC and local time can differ by timezone
Example
Timestamp 0 is the start of Unix time.
0 seconds = 1970-01-01T00:00:00.000ZFAQ
How do I know if a timestamp is seconds or milliseconds?
Millisecond timestamps are usually 13 digits; second timestamps are usually 10 digits for current dates.
Why is my converted date off by hours?
You may be comparing UTC with your local timezone.
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