Unix Timestamp Converter

What is Unix Timestamp Converter?

A Unix timestamp is the number of seconds (or milliseconds) elapsed since 1970-01-01 00:00:00 UTC — the standard way to pass time between systems. Translating timestamps into human-readable dates is one of the most frequent operations when reading logs or integrating APIs. This tool auto-detects 10-digit (seconds) and 13-digit (milliseconds) timestamps and shows local time, UTC and ISO 8601 side by side; it also converts date strings back to timestamps, with a live current timestamp pinned at the top for one-click copy.

How to Use

1. Paste a timestamp or a date string
2. The direction is detected and converted automatically
3. Copy the format you need

FAQ

What is the difference between 10- and 13-digit timestamps?

10 digits are seconds, 13 digits are milliseconds. Java's System.currentTimeMillis is milliseconds; C's time() is seconds. The tool detects both automatically.

Why is my converted result off by 8 hours?

UTC and the local timezone were probably mixed up. This tool shows local time and UTC side by side so you can confirm at a glance.

What is the Year 2038 problem?

A 32-bit signed integer holding a seconds timestamp overflows on 2038-01-19. Modern 64-bit systems are unaffected.

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