What Is a Unix Timestamp, and How Do You Convert It?

If you've seen a date stored as a number like 1732492800, that's a Unix timestamp — and understanding it makes debugging logs, APIs and databases much easier.

What a Unix timestamp actually is

A Unix timestamp counts the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC — known as the Unix epoch. 1732492800 represents a specific moment in time, calculated purely as an offset from that fixed starting point. Some systems use milliseconds instead of seconds, which is why you'll occasionally see a similar-looking number with three extra digits.

Why computers store dates this way

A single integer is simple to store, compare and sort — checking whether one moment is before another is just comparing two numbers, no calendar math required. It's also time-zone-agnostic by design: the same timestamp represents the same instant everywhere in the world, with the local date and time only calculated when it's displayed.

Where you'll run into Unix timestamps

API responses and database columns that store created_at/updated_at as a raw number.
Log files, where every entry is timestamped for precise ordering.
URLs and cache-busting query parameters.

How to convert a Unix timestamp

Paste a timestamp into the Timestamp Converter to see it as a human-readable date in ISO 8601, UTC, or your local time zone — or convert a date the other direction, into a timestamp.

FAQ

Why is my timestamp 13 digits instead of 10? That's milliseconds, not seconds — divide by 1,000 to get the standard 10-digit seconds-based timestamp (for dates in the current era).

Do Unix timestamps handle time zones? The timestamp itself represents a single global instant with no time zone attached — the time zone only matters when converting it into a human-readable date, which is where you choose UTC or your local zone.

Will Unix timestamps run out of numbers eventually? The traditional 32-bit signed timestamp overflows in 2038 (the "Year 2038 problem"), but most modern systems use 64-bit timestamps, which have no practical limit for the foreseeable future.

Convert a timestamp now

Try the free Timestamp Converter — convert in either direction instantly. See more developer tools.