What is a Unix timestamp?

It's the number of seconds (or milliseconds) that have passed since January 1, 1970 UTC — a compact, timezone-independent way to represent a point in time, used throughout APIs and databases.

How do I know if my timestamp is in seconds or milliseconds?

This tool auto-detects it: a 10-digit number is treated as seconds, a 13-digit number as milliseconds, which covers current-era timestamps in both formats.

Does the local time use my computer's timezone?

Yes — the "Your local time" row reflects your browser's system timezone, since the conversion happens on your device.

Timestamp Converter

Convert between Unix timestamps and human-readable dates.

Unix timestamp

Date & time

Processed 100% in your browser — nothing you enter here is ever uploaded.

Common use cases

Reading a timestamp from a database row

Convert a raw created_at or updated_at value from a database query into a date you can actually read.

Scheduling an API call for a future time

Convert a local date and time into the Unix timestamp an API expects for a scheduled job or reminder.

Checking a JWT's expiry claim

Compare a token's exp or iat value against the current timestamp to see exactly when it expires.

How to use the Timestamp Converter

Enter a Unix timestamp (in seconds or milliseconds) to convert it to a readable date.

Or type a date/time in the other field to get its Unix timestamp back.

"Use current time" fills in the timestamp for right now.

Every result shows ISO 8601, UTC, your local timezone, and a human-friendly relative time.