🗓️ Lifespan Lab

Date Calculator

Count days between two dates, including weekdays, or find the date that is a number of days before or after another.

Days between two dates

–days
–weeks
–weekdays (Mon–Fri)

Add or subtract days

–

Common date questions

How many days until a deadline, how old a contract is, which date is 45 working days from now, or how long ago something happened. Enter two dates to get the gap in days, weeks and months, or add a number of days to a start date.

Counting days between dates

The result counts calendar days from the start date to the end date, not including the end date. Weekdays count Monday to Friday and do not skip public holidays.

Adding days to a date

Type a number of days to move forward, or a minus number to go back. People use this for 100-day anniversaries, notice periods, due dates and deadlines.

FAQ

Does it count the end date?

The difference excludes the start day, like most calculators. Add one day if your rule counts both the first and the last day.

Does it include the end date?

No. From Monday to Tuesday is 1 day. Add 1 if you want to count both days.

Are holidays excluded from weekdays?

No, only Saturdays and Sundays are skipped.