Date Calculator
Days between dates, adding or subtracting time, age, business days, week numbers and more.
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How calculations work
Durations count calendar days, so daylight saving changes do not affect the result. Turn on “Include end date” to count both the start and end day (useful for trips or events).
Business days count Monday to Friday and do not account for public holidays. Adding months keeps the day of the month when possible, otherwise it uses the last day of the month (31 January + 1 month = 28 or 29 February).
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