Timestamp Converter

Paste a Unix timestamp, an ISO 8601 string, or a plain date and see every common format at once. Seconds, milliseconds, ISO, UTC, local time, day of the week, relative time, and your detected timezone. The "Now" button grabs the current moment.

Common use cases

Debugging API responses. You're staring at 1711545600 in a JSON payload and wondering what day that is. Paste it, see "Wednesday, March 27, 2024." Done.

Converting between formats for logs, database queries, or configuration files that each want timestamps in their own special format. Postgres wants ISO. Your cron docs use Unix. The PM asks for a human date. One paste, all three answers.

Checking token expiration. JWT exp claims are Unix timestamps in seconds. Paste the value, see if it's in the past. The relative time field tells you exactly how long ago it expired.

Things to know

The seconds-vs-milliseconds detection uses a simple threshold: if the number is larger than one trillion, it's treated as milliseconds. Smaller numbers are seconds. This works because one trillion milliseconds is roughly 2001, and almost nobody is converting timestamps from before then. If you do need pre-2001 millisecond precision, divide by 1000 first.

Date string parsing uses your browser's built-in Date constructor, which handles ISO 8601, RFC 2822, and most readable formats like "March 27, 2024" or "2024/03/27". It's forgiving but not magic. Ambiguous formats like "03/04/2024" will follow your browser's locale (month-first in the US, day-first elsewhere).

The timezone shown is yours, detected via Intl.DateTimeFormat. The UTC and local rows let you compare the same moment in both. Handy when you're coordinating across time zones and need to know "what time is that in UTC?"

Privacy

Everything runs in your browser. The timestamps you paste don't leave your machine. We don't even know you're here, technically.