Developer tool

Unix Timestamp Converter

Convert epoch seconds or milliseconds to readable UTC, local and ISO 8601 dates, or turn a date into a Unix timestamp.

Quick Jump:

Input Epoch or Date String Unix Seconds

Enter Timestamp / Date Text: OR Select Date & Time Picker:

Unix Seconds 0

Unix Milliseconds 0

Local Time -

UTC Time -

ISO 8601 -

RFC 2822 -

Relative Time -

Day of Week -

Day of Year -

Leap Year Status -

How to use this tool

Enter an epoch timestamp and confirm whether the source uses seconds or milliseconds.
Read the UTC, local and ISO date outputs; local time follows your browser's time zone.
Use the date input for the reverse conversion and copy the required timestamp unit.

Example and use case

1704067200 seconds = 1704067200000 milliseconds = 2024-01-01T00:00:00.000Z.

Limitations to check

Confirm units instead of relying only on digit count. Historical dates, negative timestamps and future values can break simple heuristics. A local date without an explicit offset is ambiguous across time zones.

Processing and privacy

The tool's browser code handles entered text or selected files locally. Optional URL imports and external resources can make network requests. This website also uses third-party scripts, including analytics and advertising. Read the privacy policy and use sample data when testing sensitive workflows.

Found a problem? Report a tool issue with the browser version and steps to reproduce it. Avoid sending private document content or credentials.

Frequently asked questions

What is the Unix epoch?

Unix timestamps count seconds from 1970-01-01 at 00:00:00 UTC. Many JavaScript interfaces instead represent the same instant in milliseconds.

Why is my converted date far in the future?

A millisecond value may have been interpreted as seconds. Check the source unit and divide by 1000 when converting milliseconds to seconds.

Does a timestamp have a time zone?

The timestamp identifies an instant. UTC and local displays are different representations of that same instant.

Related tools

Practical guides

Convert Unix Timestamps to Readable Dates: Seconds, Milliseconds and UTC