Date & Time Calculators
Date arithmetic is full of traps: leap years, month lengths that vary, and the difference between "3 months later" and "90 days later". These calculators use calendar-correct arithmetic and state which convention they follow.
10 calculators in this category.
Age
Durations
Date Difference Calculator
Calculate the time between two dates in years, months, weeks, days and working days, with the option to include or exclude the end date.
Date Calculator — Add or Subtract Time
Add or subtract years, months, weeks and days from any date, with correct handling of month lengths and leap years.
Working time
Business Days Calculator
Count working days between two dates, or find the date a given number of working days away — with custom working days and your own holiday list.
Business Hours Calculator
Count working hours between two dates and times, excluding weekends, holidays and time outside the working day — the figure SLAs are written against.
Clock time
Time Duration Calculator
Find the duration between two times of day, or add and subtract hours and minutes from a start time — handling midnight crossovers correctly.
Time Zone Converter
Convert a time from one UTC offset to another, with the local day shown and the overlap for scheduling calls across zones.