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The exact duration between two calendar dates in days, months, and years.
Date difference calculation determines the precise span between two dates, considering the Gregorian calendar rules: varying month lengths (28-31 days), leap years (divisible by 4, except century years not divisible by 400), and different calendar systems. Common uses: calculating age, tenure of employment, loan duration, project timelines, legal deadlines (statute of limitations), and interest accrual periods. The ISO 8601 standard defines date and time format as YYYY-MM-DD.