📅 Date Math tools
Add to dates, days between, weekdays, week numbers and leap years. 7 free tools, all running right in your browser.
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Business Days Calculator
Working days between dates, excluding weekends.
Date & TimeDate Calculator: Add or Subtract Days
Add or subtract days, weeks, months or years.
Date & TimeDays Between Dates
Days, weeks and months between two dates.
Date & TimeWhat Day of the Week Was It?
Weekday for any past or future date.
Date & TimeWeek Number Calculator (ISO)
ISO week number of any date, and the dates of any week.
Date & TimeDay of the Year Calculator
Day number and how much of the year is gone.
Date & TimeLeap Year Checker
Is it a leap year? Plus the next ones.