Unix Timestamp Converter

Converts a Unix timestamp in seconds or milliseconds to a readable date (ISO 8601, UTC, local time, or a validated IANA zone), and a date to a Unix timestamp. Detects whether a value looks like seconds or milliseconds and always shows which unit was interpreted, letting you change it manually instead of deciding silently.

Processed on your device, no AI

Unix timestamp

IANA zone (optional)

Date and time → timestamp

The data is processed on your device and is never sent to the server.

Use cases

Convert a log's timestamp into a readable date
Get the Unix timestamp of a specific date
Compare a date across different time zones

How to use this tool

Enter a timestamp or a date
Confirm the unit (seconds/milliseconds) if it's ambiguous
Copy the result in the format you need

Frequently asked questions

How does it know if my timestamp is in seconds or milliseconds?

It applies a rule based on the number's magnitude and always shows which unit it interpreted, letting you change it manually if it isn't the right one.

Does it work with dates before 1970?

Yes, it supports negative timestamps and dates before January 1, 1970.

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