Is my timestamp in seconds or milliseconds?

The tool detects it from the size of the number: values below 100,000,000,000 are read as seconds, larger ones as milliseconds, microseconds and nanoseconds in steps of 1,000. The detected unit is shown under the field. This is correct for any date between 1973 and 5138.

How do I convert a date to a Unix timestamp?

Use Date to timestamp: pick the date and time, choose whether it is local time or UTC, and copy the result in seconds or milliseconds.

What time zone is used?

Timestamps are shown in both your device's time zone and UTC. For date to timestamp, choose Local or UTC; the choice is remembered.

Does it handle negative timestamps?

Yes. A negative timestamp is a date before January 1, 1970 UTC.

Convert Unix timestamps for free in your browser

Convert Unix timestamps to dates and dates to timestamps, starting from the current time, in local time and UTC.

How to use Unix Timestamp Converter

Paste a Unix timestamp, or pick a date and time; both start at the current moment.
Read the date in local time, UTC, and ISO 8601, or the timestamp in seconds and milliseconds.
Copy the value you need.

Questions

Is my timestamp in seconds or milliseconds?: The tool detects it from the size of the number: values below 100,000,000,000 are read as seconds, larger ones as milliseconds, microseconds and nanoseconds in steps of 1,000. The detected unit is shown under the field. This is correct for any date between 1973 and 5138.
How do I convert a date to a Unix timestamp?: Use Date to timestamp: pick the date and time, choose whether it is local time or UTC, and copy the result in seconds or milliseconds.
What time zone is used?: Timestamps are shown in both your device's time zone and UTC. For date to timestamp, choose Local or UTC; the choice is remembered.
Does it handle negative timestamps?: Yes. A negative timestamp is a date before January 1, 1970 UTC.

Common tasks