Date Calculator
Enter the required values or choose a complete example.
What do you want to find?
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Add or subtract calendar time from a date, or find a signed calendar-day count between two dates with explicit endpoints.
Add or subtract from a date
Days between two dates
Add or subtract from a date
Days between two dates
Start date
(required)
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Choose a Gregorian calendar date. Typed/API dates use YYYY-MM-DD.
Direction
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Apply the selected direction to the whole entered movement.
Add time
Subtract time
Calendar days
(required)
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Enter a nonnegative whole calendar-day count, including zero for a month-only or year-only movement.
End date
(required)
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Choose a Gregorian calendar date. Typed/API dates use YYYY-MM-DD.
Date counting
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Elapsed gap is the date difference. Both dates adds one; neither removes one, with a minimum magnitude of zero.
Elapsed gap
Include both dates
Exclude both dates
Add years, months or weeks
Hide larger calendar units
Calendar years
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Whole calendar years are combined with calendar months before the target date is constrained.
Calendar months
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Whole calendar months are applied before the extra calendar weeks and calendar days.
Calendar weeks
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Whole calendar weeks are applied after the calendar year and month shift.
Calculate
Calendar answer
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Interpretation
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Counting basis
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Show calculation details
Hide calculation details
Calculation and counting rules
Calculation details
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Clear
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