Seconds and milliseconds
Automatic unit detection handles common epoch values while explicit controls remove ambiguity for older, future, or unusually short timestamps.
All tools
Developer time utility · Free
Unix Timestamp Converter
Translate epoch seconds or milliseconds into readable time, and convert dates back with time-zone and batch tools built in.
Conversions stay in this browser
Unix time now
–
– milliseconds
Timestamp to date
Decode an instant.
Detected as seconds
Seconds
1704067200
Milliseconds
1704067200000
ISO 8601
2024-01-01T00:00:00.000Z
UTC
Mon, 01 Jan 2024 00:00:00 GMT
Your local time
Monday, January 1, 2024 at 12:00:00 AM UTC
Relative to now
3 years ago
Monday, January 1, 2024 at 00:00:00 UTC
Date to timestamp
Encode a date.
Seconds
1704067200
Milliseconds
1704067200000
Batch converter
Many timestamps at once.
| Input | ISO 8601 |
|---|---|
| 1704067200 | 2024-01-01T00:00:00.000Z |
| 1711929600000 | 2024-04-01T00:00:00.000Z |
| 0 | 1970-01-01T00:00:00.000Z |
How it works
Move cleanly between machine time and human time.
Unix time is absolute; calendar displays are contextual. This workspace keeps the raw value, unit, and chosen display zone visible together.
- 01
Paste a timestamp
Enter epoch time in seconds or milliseconds. Automatic detection handles normal modern timestamps, or choose the unit explicitly.
- 02
Choose a view
Read the same instant as ISO 8601, UTC, local time, relative time, or in a chosen IANA time zone.
- 03
Copy or process a batch
Copy any exact value, convert a human date back to epoch time, or paste many timestamps and download the results as CSV.
Built for debugging
One timestamp, every representation you need.
Time-zone aware output
Format one absolute instant in local time, UTC, or a valid IANA zone such as Europe/Malta, America/New_York, or Asia/Tokyo.
Batch-ready workflow
Convert up to 100 newline-separated timestamps at once, review invalid rows clearly, and download a spreadsheet-friendly CSV.
Epoch time questions
Seconds, milliseconds, and time zones explained.
What is a Unix timestamp?+
A Unix timestamp counts elapsed seconds from 00:00:00 UTC on 1 January 1970. Many JavaScript systems use milliseconds instead, which produces a value roughly one thousand times larger.
How can I tell seconds from milliseconds?+
Contemporary second timestamps usually contain 10 digits, while millisecond timestamps usually contain 13. Automatic mode uses magnitude, and you can force either unit when a value is ambiguous.
Does a Unix timestamp contain a time zone?+
No. It identifies one instant in time. A time zone only changes how that instant is displayed as a calendar date and clock time.
Can Unix timestamps represent dates before 1970?+
Yes. Negative Unix timestamps represent instants before the epoch, as long as the date is within the range supported by the browser.
Is the conversion performed on a server?+
No. Date parsing, formatting, time-zone output, relative calculations, and CSV generation happen locally in this browser.
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