6 calculators
Calendar Reference
Day-of-week, leap year, days-in-month, and calendar reference calculators.
Calculators
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Age Difference Calculator
Calculate the age difference between two people from their birth dates — returned in years, months, days, and total days.
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Day of Week Calculator
Find the day of the week for any historical or future date, plus its day of year, ISO week number, and weekend status.
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Days in Month Calculator
Find how many days are in any month and year — accounting for leap-year rules for February.
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Days in Year Calculator
Find the exact number of days in any year — 365 for common years or 366 for leap years — with a clear leap-year note.
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Leap Year Calculator
Check whether a given year is a leap year, see the days it contains, and find the nearest past and upcoming leap years.
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Weekdays in Year Calculator
Count how many times each day of the week appears in a selected year, with totals for weekdays and weekend days.