Date & Time

Convert a date and time between any two IANA timezones with DST handling built in.

Convert between Unix timestamps (seconds or milliseconds) and human-readable dates.

Count business days (Mon-Fri) between two dates, or add/subtract working days from a start date.

Live countdown to any future date — days, hours, minutes, and seconds updated in real time.

Find what day of the week any date in history or the future falls on — plus week number and day-of-year.

Estimate your due date using Naegele's rule (LMP + 280 days) and track gestational age.

Millisecond-accurate online stopwatch with lap splits and countdown timer mode. Keeps running in background tabs. Free, no signup, any device.

Multi-timezone viewer — compare current time across major cities worldwide and see UTC offsets live.

Calculate exact age in days, hours, minutes, and seconds — plus life milestones countdown.

Add or subtract days, weeks, months, or years from any date. Get the resulting date and weekday.

Calculate weekly hours from daily clock-in / clock-out times. Add unpaid breaks, an hourly rate for gross pay, and copy the weekly total.