Days Between Dates Calculator
FreeCalculate the exact number of days between two dates. Includes weeks, months, working days, and weekends. Free, instant, no signup.
What's next
Settings guide
Modes of calculation:
Inclusive vs exclusive: By default, date calculators count the interval between dates exclusive of both endpoints (from-to not counting either date). Some legal and financial contexts count inclusive of both endpoints. Toggle the mode if your use case requires it — it changes the result by one day.
Working days: Working days exclude Saturdays and Sundays. This is the most commonly needed variant for business planning. Note that it does not account for public holidays — working day counts may still include bank holidays, which you would need to subtract manually.
Week calculation: The weeks figure shows complete weeks in the interval. A 10-day interval is 1 week and 3 days.
Calendar month calculation: Month differences are approximate when months have different lengths. "3 months from January 31" is ambiguous because February does not have a 31st. The calculator shows the complete calendar months in the interval and the remaining days.
Format comparison
vs counting on a calendar: Manual calendar counting is error-prone and slow. This calculator is faster and accounts for leap years automatically.
vs Excel DATEDIF: Excel's DATEDIF function calculates date differences and is powerful for spreadsheet workflows. A browser-based calculator is faster for one-off calculations without opening a spreadsheet and entering formulas.
vs a general calendar app: Calendar apps show the date in context but do not typically calculate day intervals directly. A dedicated date calculator is faster for the specific task of computing the difference between two dates.
How it works
Enter the start date
Click the start date field and select or type the date in your local format.
Enter the end date
Select the end date. The result updates immediately as you change either date.
Read the breakdown
Total days, weeks, months, working days, and weekend days all display instantly. Toggle options to adjust the calculation mode.
About this format
How many days are between January 15 and March 22? How many working days until your deadline? How many days has it been since a specific event? These questions require knowing the exact number of days between two dates — accounting for month lengths, leap years, and optionally weekends and holidays.
Date arithmetic is surprisingly error-prone when done mentally. February has 28 or 29 days. Months have 30 or 31 days in patterns that resist memorization. A mental count of "from July 28 to September 3" can easily be off by a day or two without careful tracking.
This calculator takes two dates and returns the exact day count, broken down into total days, complete weeks, calendar months, working days (Monday–Friday), and weekend days. It handles leap years correctly, including the 4-year cycle and the century-year exception (2000 was a leap year; 1900 was not).
Common use cases: project deadline planning; legal and contract date calculations; insurance waiting periods; notice period calculations; academic calendar planning; financial instrument maturity dates; and any situation where precise date arithmetic matters.