How do I calculate business days between two dates?

Use the Days Between Dates mode. The calculator automatically shows both calendar days and business days (weekdays only, excluding Saturdays and Sundays).

Does the calculator account for leap years?

Yes! The calculator correctly handles leap years (February 29th) in all its calculations, including days between dates and adding/subtracting days.

Can I add months to a date?

Yes! In Add/Subtract Days mode, you can add days, weeks, months, or years to any date. When adding months, it handles end-of-month edge cases correctly (e.g., Jan 31 + 1 month = Feb 28).

How many days are in a year?

A regular year has 365 days, while a leap year has 366 days. Leap years occur every 4 years, except for years divisible by 100 (unless also divisible by 400).

Date Calculator — Days Between Dates, Add/Subtract Days Online

How to Use Date Calculator

1
Select a mode: Days Between Dates, Add/Subtract Days, Weekday Calculator, or Age in Days.
2
Enter the date(s) using the date picker.
3
For Days Between: see calendar days, business days, weeks, and months.
4
For Add/Subtract: choose operation, enter the duration, and see the result date.
5
For Age in Days: enter your birthdate and see complete age breakdown.

About Date Calculator

"How many days until my visa expires?" "What's the date 45 business days from today?" "Was I born on a Monday or Tuesday?" If you've ever Googled any of these, this date calculator is your new best friend.

Four modes, one tool

Days Between Dates is the most-used mode. Pick two dates and get the exact count — calendar days, business days (weekdays only), and a breakdown in years/months/days. There's an "include end date" toggle because apparently that matters for contract deadlines and lease calculations.

Add/Subtract Days answers "what date is X days from now?" Add days, weeks, months, or years to any start date. Handy for project timelines, notice periods (90 days from today), and warranty expiry dates.

Weekday Calculator tells you what day of the week any date falls on. Also shows the day number of the year (e.g., March 15 = day 74), week number, whether it's a leap year, and how many days are left in the year.

Age in Days is the fun one. Enter your birthday and see your exact age in days, hours, and minutes. It also shows what day you were born on, how many leap years you've lived through, and a countdown to your next birthday. (Spoiler: you're older than you think in days.)

Handles leap years correctly, because February 29th has ruined enough calculations for humanity.

Date Calculator