Calculate the number of days between two dates, or add and subtract years, months, weeks, and days from a date. Supports business days calculation.
Find the number of years, months, weeks, and days between dates
The Date Calculator offers two core functions: finding the difference between two dates, and computing a new date by adding or subtracting a time interval.
The Days Between Dates mode calculates the exact span in years, months, weeks, days, and business days. The optional "Include end day" checkbox adds one day to the total (useful when counting both the start and end date as full days).
The Add / Subtract mode lets you find a future or past date by specifying years, months, weeks, and days to add or subtract. The "Business days" option skips weekends when counting.
All calculations are based on the Gregorian calendar, the most widely used calendar system worldwide.
Frequently Asked Questions