Timestamp Converter
Runs in your browser. Your files never leave your device.
How we keep your files private
How to use Timestamp Converter
- Enter a Unix timestamp or a date.
- Read the results in seconds, milliseconds, UTC and local time.
- Copy the format you need.
Common uses
- Reading timestamps in logs.
- Setting expiry times in APIs.
- Comparing dates across time zones.
About this tool
Convert Unix timestamps (seconds or milliseconds) to readable dates, or any date string to a Unix timestamp. Results are shown as ISO 8601 UTC, a UTC string and your local time. Ten-digit numbers are read as seconds and thirteen-digit numbers as milliseconds.
Worked example
Unix time 0 is 1 January 1970 00:00:00 UTC, and 1700000000 is 14 November 2023 22:13:20 UTC. Timestamps with 13 digits are in milliseconds: divide by 1000 to get seconds.
Common problems and fixes
- The date is in 1970.
- The value is probably in seconds but treated as milliseconds, or the value is 0 or empty.
- The time is off by some hours.
- Timestamps are UTC. Your local time differs by your time-zone offset, and daylight saving can shift it again.
- The date is far in the future.
- A millisecond timestamp was read as seconds. Divide by 1000.
Next steps
Frequently asked questions
Seconds or milliseconds?
Numbers up to 10 digits are read as seconds and 11 to 13 digits as milliseconds.
What is the Unix epoch?
1 January 1970 00:00:00 UTC, the starting point of Unix time.
Why does local time differ?
Local time uses your device's time zone, shown in the table.
Are my files uploaded to a server?
No. Everything runs inside your browser on your own device, so your files and text are never sent anywhere.
Is it really free?
Yes. There is no sign-up, no watermark and no limit on how often you use it.
Does it work on my phone?
Yes. It works in any modern browser on phones, tablets and computers. Very large files may be slow on older phones.