Date Difference Calculator
Calculate the number of days, weeks, months, or years between two dates
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About Date Difference Calculator
Understanding Date Difference Calculations
Date difference calculations have been fundamental to human civilization since the development of the first calendars. From ancient Egyptian, Mayan, and Chinese calendar systems to the modern Gregorian calendar we use today, calculating the time between events has been essential for agriculture, religious observances, and civil planning.
Mathematical Foundation
Simple Day Difference = (Date2 - Date1) / (milliseconds per day)
Adjusted Month Difference = (Year2 - Year1) × 12 + (Month2 - Month1) - Day Adjustment
Adjusted Month Difference = (Year2 - Year1) × 12 + (Month2 - Month1) - Day Adjustment
| Consideration | Description |
|---|---|
| Leap Years | 366 vs 365 days |
| Month Length | 28/29, 30, 31 days variations |
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