Date & Time — Toolkit

Convert Unix timestamps to human-readable dates and back, in local time or UTC.

Calculate the duration between two dates or moments in time, broken down by years, months, days, and more.

Calculate exact age in years, months, and days from a birth date, plus days lived and a countdown to the next birthday.

Run a countdown timer to a set duration with an alert at zero, or a stopwatch with lap splits.

Count business days between two dates, or add/subtract business days from a date — with configurable weekends and custom holidays.

Find the ISO 8601 and US week number for any date, plus its quarter, day of year, and a highlighted calendar view.