Days (inclusive): 0
Days Away: 0
Select start and end dates using date picker inputs.
Displays days between dates, both inclusive and exclusive.
Automatically shows weeks, months, and years for longer periods.
Results update instantly as dates are changed.
Supports past and future dates for versatile calculations.
The concept of calculating duration between dates is crucial in various fields like scheduling, project management, and contract periods. Accurate calculations must account for leap years and varying month lengths. Key references include ISO 8601 for date and time representation, Unicode Technical Standard #35 for locale data, and Eurostat's methodological notes on annual data calculations.
The core calculation involves converting input dates to millisecond values, taking their absolute difference, and converting this to days by dividing by (1000 * 60 * 60 * 24). The result is rounded up to a whole number. For extended units: Weeks = Days / 7, Months = Days / 30.44 (average days per month), and Years = Days / 365.25 (accounting for leap years). Results are displayed as decimals if not whole numbers.