Timestamp Converter
Convert between Unix epoch and human-readable dates
What is a Unix timestamp?
A Unix timestamp is the number of seconds (or milliseconds) since 1970-01-01 00:00:00 UTC, the 'epoch'. It's the standard time format in databases, log files, APIs, and most programming languages. Seconds-based timestamps are 10 digits long today; millisecond timestamps are 13 digits.
The converter accepts both formats, auto-detecting based on length, and renders the result in your local timezone, UTC, and ISO 8601 — pick whichever your downstream system needs. The reverse direction works too: enter a date and get the corresponding timestamp.
Examples
| Input | Result |
|---|---|
| 1700000000 | 2023-11-14T22:13:20Z (UTC) · ISO 8601 |
| 2024-01-01T00:00:00Z | 1704067200 (seconds) · 1704067200000 (ms) |
Frequently asked questions
Seconds or milliseconds?
Most APIs use seconds (10-digit timestamps). JavaScript's `Date.now()` and many newer systems use milliseconds (13-digit). The tool auto-detects based on length.
Is the timestamp timezone-aware?
The timestamp itself is always UTC. Display is in your local timezone by default; toggle to show UTC or ISO 8601 with offset.
What happens after the year 2038?
32-bit signed Unix timestamps overflow at 03:14:07 UTC on 2038-01-19 (the Year 2038 problem). 64-bit timestamps are immune — most modern systems already use them.
Can I convert between timezones?
Pick your target timezone in the output panel. The conversion is purely a display change — the underlying timestamp doesn't move.
Is anything uploaded?
No — conversion runs in your browser using the native `Date` API.