Date math

10 date math tools in Dates & Time. Each one runs in this tab, so nothing you paste in leaves the machine.

All date math tools

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Date Range Generator
Create a sequence of dates between start and end dates
Age Calculator
Compute exact age from birthdate
Days in Month
Find how many days are in any month
Date Difference
Compute the gap between two dates in years, months, weeks, and days
Quarter Calculator
Determine the fiscal quarter for any date
Week Number
Get the ISO week number for any date
Day of Year
Find the day number within the year for any date
Leap Year Checker
Check if any year is a leap year with detailed explanation
Date Add/Subtract
Add or subtract days, months, and years from any date
Workdays Calculator
Count business days between two dates