Convert Unix ↔ Date

Unix timestamps are everywhere once you start noticing them: in API responses, database rows, log files, access tokens, cookie expiry fields. They are also completely unreadable — 1721287227 is 2024-07-18 10:00:27 UTC, but nobody carries that arithmetic in their head. This tool converts timestamps to human-readable dates, and dates back to timestamps, in both directions.

Paste one timestamp or a whole column of them, one per line — the tool processes each line, which makes it practical for bulk log conversion, not just one-off lookups. Two modes are available: Unix-to-date for decoding timestamps, and date-to-unix for encoding dates when you need to construct an API parameter or set an expiry. Dates with explicit UTC offsets (like +08:00) are accepted in date-to-unix mode, so you can encode a time as it was expressed in another timezone without first converting it yourself.

The settings that prevent the classic mistakes: choose UTC or your local timezone for display, and toggle the UTC suffix label on or off in the output. The single most common pitfall with timestamps is unit confusion — some systems emit seconds, others milliseconds, and a millisecond timestamp read as seconds lands in January 1970. If your conversion produces a date in 1970, your input is almost certainly in milliseconds: drop the last three digits (or divide by 1000) and try again.

Conversion runs entirely in your browser as you type; nothing is sent to a server. It is also a handy tool for sanity checks — 0 converts to the epoch itself, and 2147483647 converts to January 2038, the famous 32-bit time limit, which is exactly what a quick decoder like this should tell you.