What is a Unix timestamp?

It's the number of seconds (or milliseconds) elapsed since January 1, 1970, 00:00:00 UTC — the standard way of handling time in programming.

How do I tell seconds from milliseconds?

A 10-digit value is usually seconds, and a 13-digit value is milliseconds. The tool detects this automatically, but you can also set it manually.

The result is shown in both your local time (based on your browser) and UTC.

Unix epoch ↔ date/time, with millisecond and time zone support

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Convert Unix timestamps (in seconds or milliseconds) into human-readable dates and times, and vice versa. It also shows the current timestamp live.

What is a Unix timestamp?: It's the number of seconds (or milliseconds) elapsed since January 1, 1970, 00:00:00 UTC — the standard way of handling time in programming.
How do I tell seconds from milliseconds?: A 10-digit value is usually seconds, and a 13-digit value is milliseconds. The tool detects this automatically, but you can also set it manually.
How are time zones handled?: The result is shown in both your local time (based on your browser) and UTC.