Day Calculator
Days between dates, date math and age
How it works
Three modes in one tool. ‘Between’ counts the total days, weeks, months and business days between two dates. ‘Add / Subtract’ shifts a date by a number of days, weeks, months or years and shows the resulting date and weekday. ‘Age’ turns a birthdate into an exact age in years, months and days, total days lived, and a countdown to the next birthday.
Frequently asked
How do I count days between two dates?
Use the ‘Between’ mode, pick a start and end date, and you'll get the total days plus a weeks/months breakdown and the number of business days.
Can it add or subtract days from a date?
Yes. In ‘Add / Subtract’ mode, enter a date and a signed amount with a unit (days, weeks, months or years) to get the resulting date.