Date & Time Converter

Convert Unix timestamps (seconds, milliseconds, microseconds, nanoseconds) to ISO 8601, RFC 2822, and other date formats — including Excel serial numbers and Windows FILETIME.

How to use Date & Time Converter

1. The current time is shown live; turn off the Live switch to pin a moment.
2. Edit any Unix field (seconds, milliseconds, microseconds, nanoseconds, and more) and every other value updates.
3. Paste a timestamp or date string and press Enter — the unit and format are detected automatically.
4. Switch between local time and UTC, then copy the format you need.

Frequently asked questions

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

10 digits are seconds (classic Unix time) and 13 digits are milliseconds, which is what JavaScript Date.now() returns.

Does it handle Excel serial numbers and Windows FILETIME?

Yes. Excel serial numbers, Apple absolute time (since 2001), and Windows FILETIME (100-ns units since 1601) are shown and can be edited directly.