Date Add/Subtract Calculator
Add or subtract days, weeks, or months from a date
About Date Add/Subtract Calculator
Understanding Date Mathematics
Date calculations are essential for project planning, scheduling, and timeline management. The complexity comes from various calendar systems, business day conventions, and timezone considerations. This calculator helps you navigate these complexities while ensuring accurate results.
Calendar Systems
Gregorian Calendar Rules
• Years: 365 days (366 in leap years)
• Months: 28-31 days
• Weeks: 7 days
• Business Days: Monday-Friday
• Leap Year: ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)
• Months: 28-31 days
• Weeks: 7 days
• Business Days: Monday-Friday
• Leap Year: ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)
Key Challenges
- Complex leap year calculations
- Variable month lengths
- Week boundary handling
- Business day vs calendar day
- International date line effects
Time Units and Conversions
Standard Calendar Units
- Years: Gregorian, fiscal, academic, lunar
- Months: Calendar, fiscal periods
- Weeks: Standard 7-day, business week
- Days: Calendar days, business days
- Custom periods for specific needs
Business Calendar Components
- Working days vs. holidays
- Regional weekend patterns
- Bank holidays
- Fiscal year variations
- International conventions
Business Applications
Project Management
- Sprint planning and iterations
- Project timeline development
- Resource allocation periods
- Milestone tracking
- Gantt chart calculations
Financial Operations
- Payment term calculations
- Contract duration management
- Interest accrual periods
- Fiscal year planning
- Trading day calculations
Common Edge Cases
Technical Considerations
- Date object manipulation complexity
- Timezone handling
- DST transitions
- Leap year edge cases
- Month-end rules
Edge Cases
- Date validity verification
- Century/millennium handling
- Historical dates
- Future date projections
- Calendar reform considerations
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