Date Calculator
Figure out how many days between two dates, or add and subtract days from any date
Start Date
End Date
Days Between
0
Weeks Between
0
Months Between
0
Years Between
0
Start Date Details
Date: Select a date
Day of Week: Select a date
Day of Year: 0
Week of Year: 0
Leap Year: No
End Date Details
Date: Select a date
Day of Week: Select a date
Day of Year: 0
Week of Year: 0
Leap Year: No
Note: Date calculations are based on the Gregorian calendar. Month calculations use an average of 30.44 days per month, and year calculations use 365.25 days per year for leap year adjustments.
How It Works
Calculate days between two dates, or add/subtract days from any date. The calculator handles leap years (every 4 years, except centuries unless divisible by 400), different month lengths (28-31 days), and shows you the day of the week too.
Useful for project deadlines, event countdowns, age calculations, or figuring out dates for anything.
FAQ
How do I calculate days between dates?
Enter both dates and it'll show you the days, weeks, and months between them.
How do I add or subtract days?
Pick your starting date, choose Add or Subtract, enter the number of days, and it'll show you the result date.
Does it handle leap years?
Yes, automatically. Leap years happen every 4 years (2024, 2028...), except century years unless they're divisible by 400 (2000 was, 1900 wasn't).