【Date Interval Calculation Instructions】
1. Calculate the Interval between two dates by days, weeks, and months, and the result is negative if the previous date is later.
2. Add to or subtract from a certain date by a certain number of days, workdays, weeks, or months.
All inputs are in the Gregorian calendar, with the earliest effective date being January 1, 1901. If the month and day values are out of range, they will be automatically adjusted to the correct date. For example, if you enter November 32, it will be adjusted to December 2.
Saturday and Sunday and holidays are skipped for weekday calculations.(You can modify holidays in future.)
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more tools will be added.