10 digits
Modern Unix timestamps are commonly represented as 10-digit seconds.
053 · DATE & TIME
Unix Timestamp Converter
Convert Unix timestamps to readable dates or convert dates to Unix seconds and milliseconds.
LOCALCALCULATE IN YOUR BROWSER
HOW TO USE
How to use
- 01
Choose Timestamp → Date or Date → Timestamp.
- 02
For timestamp input, explicitly choose seconds or milliseconds.
- 03
For date input, enter a local date and time from your browser timezone.
- 04
Review UTC, Local Time and ISO 8601, or seconds and milliseconds.
- 05
Copy any result row you need.
TIMESTAMP GUIDE
Understanding timestamp units and timezones
The same instant can have different numeric units and different UTC/local displays.13 digits
JavaScript Date.now() commonly returns 13-digit milliseconds.
Same instant
The timestamp stays the same; timezone is applied only when displaying it.
IMPORTANT NOTES
Important notes
- A Unix timestamp itself does not contain timezone information.
- Seconds and milliseconds differ by a factor of 1000, so verify the unit.
- Local Time uses your device's browser timezone.
- 10/13-digit detection is only a warning and never changes your selected unit.
- Inputs are not sent to or stored on a server.
FAQ
Frequently asked questions
01What is a Unix timestamp?+
It is a numeric time value measured from 1970-01-01 00:00:00 UTC.
02What is the difference between 10 and 13 digits?+
10 digits are commonly seconds and 13 digits are commonly milliseconds, but digit count alone is not definitive.
03Why are UTC and Local Time different?+
They are two timezone displays of the same instant.
04Do date conversions return both units?+
Yes. Seconds and milliseconds are both shown.
05Are microseconds supported?+
Not in the first release scope.