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Number of Days Calculator
Calculate days between dates, add or subtract days from any date with advanced filtering options
Calculate Number of Days
How to Use the Number of Days Calculator
Three Calculation Modes
- Between Two Dates: Calculate the exact number of days between any two dates
- Add Days: Find what date it will be after adding a specific number of days
- Subtract Days: Find what date it was before subtracting a specific number of days
Advanced Features
- Include End Date: Choose whether to include the final date in your calculation
- Business Days Only: Count only Monday through Friday, excluding weekends
- Custom Days: Select specific days of the week to include in calculations
- Multiple Units: See results in days, weeks, months, years, and hours
Calculation Methods
Same Month and Year
For dates in the same month and year, simply subtract the day numbers. For example: April 17, 2023 - April 4, 2023 = 13 days.
Different Months, Same Year
Calculate days from January 1st to each date, then find the difference. Account for varying month lengths and leap years.
Different Years
Calculate partial years separately: days remaining in start year, complete years between dates, and days elapsed in end year.
Common Use Cases
- Project planning and timeline management
- Age calculations and anniversary counting
- Business day calculations for contracts
- Event countdown and scheduling
- Historical date analysis
- Payroll and billing period calculations
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Quick Facts
Average Days per Month: 30.44 days (365.25 ÷ 12)
Business Days per Year: ~261 days (varies by year)
Leap Year Frequency: Every 4 years (with exceptions)
Days in February: 28 days (29 in leap years)
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