Date Difference Calculator
Years · months · days between two dates
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Primary difference
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Days
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Weeks
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Months
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Hours
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Seconds
Date math
Exclusive ends (default) count whole days between two instants. Inclusive adds 1 to include the end date itself — typical for rental/leave calculations.
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When to use inclusive vs exclusive days?
Exclusive: time between two events (e.g., Jan 1 to Jan 10 = 9 days). Inclusive: count both endpoints (e.g., leave from Jan 1 to Jan 10 = 10 days of leave).
Tip: For interest accrual and legal deadlines, confirm whether the relevant convention is exclusive (most banking) or inclusive (rent, leave).