Unix Timestamp Converter
Free, locally-processed unix timestamp converter for fast and secure results.
Runs locally in your browser
Your inputs are processed locally in your browser and are not uploaded or stored by us.
Convert between exact UTC calendar dates and Unix timestamps in seconds or milliseconds.
How to use the Unix Timestamp Converter
- Select whether to convert a Date to a Timestamp, or a Timestamp to a Date.
- Choose whether to use seconds or milliseconds.
- Enter the UTC date/time or the Unix timestamp.
- Select Convert.
Calculation methodology
Unix Epoch = January 1, 1970, 00:00:00 UTC
The calculator safely converts dates directly mapped to Universal Time Coordinated (UTC). It strictly preserves exact integer boundaries to prevent floating point inaccuracies.
Worked example
ModeDate to Timestamp
Date (UTC)2000-01-01 00:00:00
UnitSeconds
Calculate elapsed seconds since 1970-01-01.
Result: 946684800
Notes
- Are local timezones applied? No. The calculator strictly enforces a UTC pipeline so a converted timestamp always represents the exact same absolute moment globally.
- Are negative timestamps supported? Yes. Dates before 1970 generate correct negative timestamps.