1
Choose a direction
Use Timestamp to date or Date to timestamp.
Developer Tools
Free tool
Unix Timestamp Converter
Convert epoch timestamps and dates locally with clear UTC and local time output.
No account needed · Processed in your browser
How to convert Unix timestamps
Both directions are calculated locally in your browser.
2
Set unit and zone
Choose seconds, milliseconds or auto detect; for a date choose UTC or local time.
3
Review and copy
Compare seconds, milliseconds, ISO, UTC and local time.
Understand the conversion
A Unix timestamp is the number of seconds since 1 January 1970 at 00:00:00 UTC. Use this converter to move between epoch seconds or milliseconds and readable dates locally in your browser.
Seconds and milliseconds
Milliseconds equal seconds multiplied by 1,000. Reverse conversion uses the selected UTC or local zone.
Example: epoch zero
0 seconds corresponds to 1970-01-01T00:00:00.000Z. Local display can show a different clock time.
UTC and local display can differ without changing the underlying instant.
Seconds, milliseconds and time zones
Seconds are shorter values; milliseconds have three extra digits. Auto detection uses the magnitude of a modern timestamp, and the detected unit is shown. UTC is consistent across systems, while local time follows your device time zone and daylight saving rules.
Before the epoch
Negative timestamps represent dates before 1 January 1970. They are supported when the browser's date range supports them.
Privacy and limits
No values are uploaded, stored or synced. Results depend on the browser date range and your selected UTC or local interpretation.
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View allFrequently asked questions
What is epoch zero?
It is 1970-01-01 00:00:00 UTC, represented by timestamp 0.
Why can local and UTC output differ?
Local output applies the time zone configured on your device; UTC does not.
Does daylight saving time matter?
Yes. Local conversions use the browser's time-zone rules, including daylight saving changes.