Convert tool

Timestamp Converter

Convert Unix timestamps and human-readable dates. Free, private and processed locally in your browser.

Unix timestamps, units and timezones

Unix timestamps represent an instant relative to 1970-01-01 00:00:00 UTC. Convert them when debugging API responses, database records, logs or token claims, and compare local, UTC and ISO 8601 views without changing the underlying instant.

Unix seconds

1704067200

UTC and ISO 8601

UTC
Mon, 01 Jan 2024 00:00:00 GMT

ISO 8601
2024-01-01T00:00:00.000Z

Common timestamp mistakes

Seconds versus milliseconds: Current Unix seconds usually have 10 digits; milliseconds usually have 13. Using the wrong unit can produce a date decades away or outside the supported range.
Local time versus UTC: A timestamp identifies one instant. Local and UTC displays can show different clock times because they apply different timezone offsets.
Missing timezone information: A browser date-and-time input is interpreted in your local timezone. Use an ISO 8601 value with Z or an explicit offset when exchanging dates between systems.

Frequently asked questions

What is a Unix timestamp?: It is the number of elapsed seconds or milliseconds since the Unix epoch at 1970-01-01 00:00:00 UTC.
How does automatic unit detection work?: DevKitFern treats absolute values of 100 billion or more as milliseconds and smaller values as seconds. Choose the unit explicitly when the source format is known.
Does converting to local time change the timestamp?: No. Local, UTC and ISO 8601 outputs are different representations of the same instant.