Unix Timestamp Converter

How to use this calculator

Choose timestamp-to-date or date-to-timestamp. For timestamps, choose the input unit and paste up to 100 values, one per line. For a date, enter a local date, time and zone. If daylight saving repeats that local time, choose the earlier or later occurrence.

Results include UTC, local time and all four epoch units. Arithmetic preserves up to nine fractional digits in seconds, six in milliseconds, three in microseconds and whole nanoseconds. Negative timestamps are supported. Values must fall in UTC years 1900–2100. Invalid dates, nonexistent local times and ambiguous times without an occurrence choice are rejected.

A worked example

0 seconds is 1970-01-01T00:00:00Z. 1,000 milliseconds represents one second after the epoch (enter 1000 without a comma). A timestamp of -1 nanosecond is 1969-12-31T23:59:59.999999999Z.

Does Unix time include leap seconds or depend on my computer clock?

Unix timestamps exclude leap seconds. This converter transforms the values you enter; it does not read your device's current time. Local display uses your browser's time-zone rules. Choose units explicitly instead of relying on the number of digits.

Further reading: Epoch timestamp reference. Your entered rules determine this result.

Which calendar and years are supported?

Use Gregorian dates from 1900 through 2100. Calculations run in your browser on request. Holidays must be entered for your own workplace. Calendar downloads contain all-day markers; trip checkout dates are excluded, while project markers span through each task's finish date. Unix conversion uses UTC-year bounds and your browser's time-zone database.

What happens to my dates?

Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.