Timestamps · ISO · RFC · runs in your browser
Date & Timestamp Converter
Convert a date or Unix timestamp between ISO 8601, RFC, Unix epoch, Mongo ObjectID and Excel formats at once.
About this tool
Convert between Unix timestamps, ISO 8601 and human-readable dates in both directions. Paste an epoch value from a log line and read it back as a date and time, or pick a date and get the timestamp for your code or database query.
It handles seconds and milliseconds and shows the value clearly so you can debug time-related bugs fast. Conversion is done in your browser using your local time zone.
Frequently asked questions
What is a Unix timestamp?+
It is the number of seconds (or milliseconds) elapsed since 1 January 1970 UTC, the Unix epoch. It is timezone-independent, which is why systems store time this way.
Seconds or milliseconds — how do I tell?+
A 10-digit value is typically seconds; a 13-digit value is milliseconds. JavaScript uses milliseconds, while many Unix tools and databases use seconds.
What is ISO 8601?+
It is the international date format like 2026-06-13T14:30:00Z. It sorts naturally as text and is unambiguous across locales, which makes it ideal for APIs and logs.