Date & Time

Convert Unix timestamps to readable dates and back.

Count the days, weeks, months and years between two dates.

Check whether a year has 366 days, and see which years nearby do.

Convert a duration between milliseconds, seconds, minutes, hours, days and weeks.

Find which weekday a date falls on, plus its week and quarter.

Build a Discord timestamp tag that renders in the timezone of whoever reads it.

Read a cron schedule in plain words and see when it runs next.

Cut a clock time or duration down to the nearest second, minute, quarter hour, half hour or hour.