What is a Unix timestamp?

A Unix timestamp is the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970, not counting leap seconds.

Why do some timestamps have 13 digits?

13-digit timestamps are milliseconds since the Unix epoch. JavaScript's Date.now() returns milliseconds.

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Timestamp Converter

Convert Unix timestamps to human-readable dates and back.

Unix timestamp (seconds)

Date & time

Timezone (IANA)

Timestamps in APIs and Databases

Most REST APIs return timestamps as Unix integers rather than formatted strings for consistency across timezones. Converting them to human-readable form is essential for debugging and logging.

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