Date & Time

Age Calculator

Exact age in years, months, and days — plus days to your next birthday.

Days Between Dates

Count the days, weeks, and months separating any two dates.

Add or Subtract Days From a Date

What date is 30, 90, or N days (or weeks, months, years) from any date?

Days Until Calculator

A clean count of days remaining until any date.

Hours Calculator (Time Card)

Total worked hours from clock-in/out times, with optional pay.

Business Days Calculator

Count working days (excluding weekends) between two dates.

Week Number Calculator

The ISO 8601 week number for any date.

Roman Numeral Converter

Convert numbers to Roman numerals and back.

Time Duration Calculator

The length of time between two clock times.

Day of the Week Calculator

What day of the week any date falls on.

Age Difference Calculator

The exact age gap between two birth dates.

Add Business Days Calculator

Add or subtract working days from a date.

Weeks Between Dates Calculator

Count the weeks (and days) between two dates.

Time Zone Converter

Convert a time between world time zones, DST-aware.