Epoch/Unix Timestamp Converter

Count the digits. A 10-digit number (e.g., 1700000000) is seconds. A 13-digit number (e.g., 1700000000000) is milliseconds — as used by JavaScript's Date.now() and many APIs. This tool auto-detects which unit to use based on digit count.

ISO 8601 (2023-11-14T22:13:20Z — machine-readable, used in APIs), RFC 2822 (Tue, 14 Nov 2023 22:13:20 +0000 — used in email headers), local format (your browser locale), UTC string, raw seconds and milliseconds values, and relative time (e.g. "2 years ago"). All formats update simultaneously.

Select any timezone from the dropdown. The Unix timestamp itself has no timezone — it always counts seconds from the UTC epoch. The tool applies the selected timezone offset to display the equivalent local time. Changing timezone changes the displayed date/time but not the underlying timestamp value.

JavaScript: new Date(timestamp * 1000) (multiply by 1000 since JS uses ms). Python: datetime.fromtimestamp(ts) or datetime.utcfromtimestamp(ts). PHP: date("Y-m-d H:i:s", $ts). MySQL: FROM_UNIXTIME(ts). Go: time.Unix(ts, 0). The reverse (date to timestamp): JS: Math.floor(Date.now()/1000), Python: int(datetime.now().timestamp()), PHP: strtotime("2024-01-01").

On 32-bit systems, Unix timestamps are stored as a signed 32-bit integer with a maximum value of 2,147,483,647, which represents January 19, 2038 at 03:14:07 UTC. After that, the counter overflows to a negative number. Modern 64-bit systems use 64-bit timestamps and will not overflow for approximately 292 billion years. Most current servers and databases are unaffected.

The Quick Timestamps section inserts preset values: Now (current Unix timestamp), Start of Today (midnight local time), Start of Year (Jan 1 00:00:00), and Yesterday. These are useful shortcuts when debugging time-range queries or testing API filters without manually calculating timestamps.

No. All conversions run locally in your browser via JavaScript. Timestamps and dates never leave your device. The live timestamp counter also runs purely client-side.