Date calculator: days between dates, add days and age
Count the days between two dates (calendar and business days), add or subtract days, weeks, months or years, and calculate exact age.
How it works
The calculator has three modes. "Difference" tells you how many days, weeks, months and years are between two dates, and how many of those are business days (Monday to Friday). "Add or subtract" gives you the date that results from adding or removing a period, such as 30 business days for a deadline.
"Age" computes exact age in years, months and days from a birth date and how many days are left until the next birthday. It also shows the weekday of each date.
Frequently asked questions
Do business days exclude holidays?
The tool excludes Saturdays and Sundays. Holidays vary by year and country, so you can enter them in the holidays field to exclude them too.
Is the start day counted?
Not by default, as with most deadlines. Turn on "Include end day" if you need to count both ends.
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