Unix Timestamp Converter

Convert Unix timestamps to dates and back, in any unit.

Direction

Unix timestamp

Paste a value in any unit.

Unit

What does Unix Timestamp Converter do?

Convert between Unix timestamps and human dates in both directions. The unit — seconds, milliseconds, microseconds or nanoseconds — is detected from the magnitude, and results are shown in UTC, your local zone and ISO 8601 at once.

How to Use Unix Timestamp Converter

1
Paste a timestampIn any unit — it is detected automatically.
2
Read the dateShown in UTC, local and ISO formats.
3
Or work backwardsEnter a date to get its timestamp.

Key Features

Automatic unit detection with a manual override
Results in UTC, your local time zone and ISO 8601 simultaneously
Reverse conversion from a date and time back to a timestamp
Relative description such as "3 days ago"
Day of week, week number and day of year shown alongside

Frequently Asked Questions

What is a Unix timestamp?

The number of seconds since 00:00:00 UTC on 1 January 1970, ignoring leap seconds. It is timezone-independent, which is why almost every system stores instants this way.

Seconds or milliseconds?

Unix tools, databases and most APIs use seconds. JavaScript’s Date.now() returns milliseconds. Getting this wrong is the classic bug — a millisecond value read as seconds lands around the year 55,000.

What is the year 2038 problem?

A signed 32-bit timestamp overflows on 19 January 2038, wrapping to 1901. Modern systems use 64-bit values and are unaffected, but legacy embedded software and old database columns still carry the risk.

Why does the local time differ from what I expect?

Because the timestamp is an absolute instant, rendered in your browser’s time zone. The same value shows as different wall-clock times in different places — that is the point of storing UTC.

Runs in your browser

Dates and times are calculated in your browser using its built-in IANA time zone database. Nothing you enter is transmitted.

How the rest of the site handles data