1
Choose a unit
Pick Seconds or Milliseconds — it applies to both conversion directions.
Developer Tools
Timestamp Converter
Convert Unix timestamps to and from human-readable UTC dates.
Convert Unix timestamps to human-readable UTC dates, or dates back to timestamps, entirely in your browser. Working with JSON from an API? Pair this with the JSON Formatter.
Conversion happens entirely in your browser. Nothing is sent anywhere.
Timestamp → Date
Date → Timestamp
How it works
Private timestamp conversion in your browser
2
Convert a timestamp or a date
Enter a Unix timestamp to get its date, or a UTC/ISO 8601 date to get its timestamp.
3
Copy the result
Copy the UTC date, ISO 8601 string, local time, or timestamp you need.
Use cases
When this comes in handy
Debug an API response
Turn a raw Unix timestamp from a log or API payload into a readable date.
Build a test fixture
Get the exact timestamp for a specific UTC date and time for test data.
Compare timestamps across formats
Check whether a seconds or milliseconds timestamp matches the date you expect.
FAQ
Common questions
Is my data uploaded anywhere?
No. Conversion happens entirely in your browser using native JavaScript Date logic.
Are timestamps in seconds or milliseconds?
Whichever you choose with the unit selector. It applies to both the timestamp input and the timestamp result, so there's no guessing from digit count.
What timezone is used?
Results are shown in UTC first and labeled clearly, since that's an unambiguous, deterministic result. Your local time is also shown, explicitly labeled with its UTC offset.
What date formats can I enter?
YYYY-MM-DD HH:mm:ss (interpreted as UTC), or ISO 8601 with an explicit timezone, like 2026-01-01T00:00:00Z or with a +/-HH:mm offset.
What happens with an invalid or out-of-range date?
You'll see a clear error message instead of an incorrect result or a crash.
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