Date Calculator

Days between dates, date math, and day-of-week finder.

Start date

End date

Start date

Days

Add Subtract

Date

About this calculator

Three date tools in one. Days Between Dates gives the total gap in days, weeks, months, and years. Add/Subtract Days finds a new date by adding or removing a number of days. Day of the Week tells you what day any date falls on.

Common uses

How many days until a deadline, event, or vacation
What date is 90 days from today?
What day of the week is a specific date?
How many days between two contract dates

FAQ

Does it include both the start and end date?: The difference is calculated as the absolute gap in days. Whether you count inclusively depends on your use case.
Does it account for leap years?: Yes. The calculation uses real calendar dates, so leap years are handled correctly.