Unix Timestamp Converter

What the Unix timestamp converter does

A Unix timestamp is the number of seconds since the epoch — 00:00:00 UTC on 1 January 1970. This converter turns an epoch value into a human-readable date (in UTC, your local time, and ISO 8601) and back the other way, shows the relative time ("3 hours ago"), and keeps a live clock ticking. It handles both seconds and millisecond timestamps.

How to convert a timestamp

1. Paste a Unix timestamp to see the date in UTC, local, and ISO formats.
2. Or pick a date and time to get its epoch value.
3. Watch the relative-time readout to sanity-check the result.

Why epoch time trips people up

Two gotchas cause most bugs: seconds vs milliseconds — JavaScript's Date.now() returns milliseconds while most Unix APIs use seconds, a 1000× difference that lands you in 1970 or the year 52,000 — and time zones, since epoch is always UTC but humans read local time. This tool shows both so the mismatch is obvious.

Timestamps show up everywhere: JWT exp / iat claims, log lines, and job schedules. To turn a recurring schedule into plain English, use the cron expression builder.