ganak.appDays Calculator
Calculate the number of days between two dates or add/subtract days from any date. Shows total days, weeks, months, hours, minutes, weekdays, and weekend days. Supports inclusive and exclusive counting. Free online days calculator with instant results for project planning, deadlines, countdowns, and date arithmetic.
Select your dates to see the results
How to Use This Days Calculator
Calculate days between dates or add/subtract days from any date
Choose Your Calculation Mode
Select "Days Between" to find the number of days between two dates, or "Add/Subtract Days" to find a future or past date from a starting date.
Enter Your Dates
Use the date pickers to select your start and end dates. In "Add/Subtract Days" mode, enter the number of days to add or subtract. You can toggle "Include end date" to count the final day in the total.
View Your Results
Results update instantly. See the total days, weeks, months, hours, minutes, weekdays, and weekend days. Use the share button to copy or share your calculation.
Understanding Day Calculations
How date arithmetic, weekday counting, and inclusive vs exclusive counting work
How Days Between Dates Works
The calculator counts every calendar day between your start and end dates. By default, it excludes the end date (e.g., January 1 to January 3 = 2 days). Toggle "Include end date" to count both the start and end dates (making it 3 days). This is the same approach used by timeanddate.com and most date calculators.
Year-Month-Day Breakdown
The breakdown into years, months, and days follows the chronological method: first calculate full years, then remaining full months, then leftover days. This accounts for varying month lengths (28-31 days) and leap years. For example, January 15 to March 10 is 1 month and 23 days (not simply 54/30).
Weekdays vs Weekend Days
The calculator counts Monday through Friday as weekdays and Saturday-Sunday as weekend days. This is useful for project planning, business deadlines, and work schedules. Note that public holidays are not excluded from the weekday count — use our Business Days Calculator for holiday-aware calculations.
Common Counting Mistakes
A frequent source of confusion is whether to include the end date. Legal deadlines, rental agreements, and medication schedules often include both the start and end dates (inclusive counting). Elapsed-time calculations (e.g., "how many days until") typically exclude the end date. Always check which convention applies to your use case.
Frequently Asked Questions
Common questions about calculating days between dates, inclusive counting, and date arithmetic