Date & Time

Calculate dates, working days, weeks and time zones.

Date Calculations

Age CalculatorEnter a birth date to see the exact age in years, months and days — today or on any date you choose.
Date Difference CalculatorPick two dates to see how far apart they are — in days, weeks, months and years at once.
Date CalculatorAdd or subtract days, weeks, months or years from any date and see exactly where you land.

Calendar, Weeks & Workdays

Business Days CalculatorCount working days between two dates, or jump ahead N business days — weekends and the holidays you list are skipped automatically.
Week Number CalculatorSee the ISO week number of any date with the week’s Monday-to-Sunday range — or look a week number up in reverse.
Weekday CalculatorPick any date to see its weekday, ISO week, day of year, leap-year status and weekend check.

Time, Timing & Time Zones