Timestamp Converter

Convert Unix timestamps to readable dates and back. Toggle seconds vs milliseconds and copy results in one click.

Tip: Your selection applies immediately. Use “Done” to close the picker on mobile.

Results

Enter a valid timestamp or date/time.

Timestamp Tips & Use Cases

Identify Units

10 digits usually means seconds; 13 digits means milliseconds.

Avoid Time Zone Bugs

Store epoch values; format to Local/UTC only at the edges (UI, logging).

APIs & Databases

Browsers use ms; many backends use s. Convert consistently on boundaries.

Local & Private

All conversions run client‑side. No data is sent to servers.

Fast, Accurate Conversions

Unix Seconds & ms

Convert between 10‑digit seconds and 13‑digit milliseconds.

Two‑Way Conversion

Epoch to date/time and date/time back to epoch timestamps.

Local, UTC & ISO

View formatted Local time, UTC, and ISO‑8601 strings.

Copy Results

Copy any output with a click for quick sharing and debugging.

Mobile Friendly

Responsive layout works great on phones, tablets, and desktops.

What is a Unix Timestamp?

A Unix timestamp is the number of seconds that have elapsed since January 1, 1970 (UTC), not counting leap seconds. Developers use it to represent moments in time consistently across systems and time zones.

Seconds vs Milliseconds

Many APIs use seconds (10 digits), while browsers and some databases use milliseconds (13 digits).

  • To convert seconds → milliseconds, multiply by 1000.
  • To convert milliseconds → seconds, divide by 1000 and floor the value.

Common Formats

  • Local time: formatted using your device time zone.
  • UTC: Coordinated Universal Time, time zone–agnostic.
  • ISO 8601: Machine-friendly standard (e.g., 2025-08-09T12:34:56Z).

FAQ

Is any data sent to a server?

No. All conversions run locally in your browser for privacy.

What about daylight saving time (DST)?

Unix timestamps are absolute. DST only affects the local representation, not the underlying epoch value.

Why do some timestamps have 10 vs 13 digits?

10-digit values are seconds since epoch; 13-digit values are milliseconds since epoch.