About epochkit

epochkit is a small, independent project that gives developers fast, accurate, in-browser tools for the timestamps and date formats that come up in real codebases: Unix (POSIX) time, ISO 8601 / RFC 3339, cron expressions, time zone conversions, and the timestamp markup used by Discord, Slack, and YouTube. The tools run entirely client-side — nothing you type is sent to a server, and no signup is required.

Who makes epochkit

epochkit is an independent project, built and maintained by one developer. It exists because most online timestamp converters are either wrong about edge cases (DST, leap seconds, the year 2038, Discord's <t:...:F> flags) or buried in ads — this is the clean set of utilities that was missing, one that matches the specs.

How our guides are written

Every guide on epochkit is written and tested by a human. For each article, we run the examples in epochkit's own tools and verify behavior against the relevant specification:

— Unix time: POSIX.1 / IEEE Std 1003.1
— Date format: ISO 8601 / RFC 3339
— Cron syntax: crontab(5) and Vixie cron behavior where relevant
— Platform timestamps: Discord, Slack, and YouTube developer documentation

We use AI tools to help draft and structure the text, but every guide is reviewed, fact-checked, and tested by a developer before it goes live, and updated when specifications, platform behavior, or tool implementations change.

Contact

Found a bug, an incorrect example, or have a question? Email: contact@epochkit.dev. We especially welcome corrections — send us the spec section we got wrong and we'll fix it.