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BussinessCalendar.addDays function adds an extra day to weekends



When days are added to Saturday or Sunday in BussinessCalendar.addDays(), an extra day is added in the result.

Error Messages

Not Applicable

Steps to Reproduce

Add 1 day to weekend days (Saturday or Sunday) and check the result.

Root Cause

An issue in custom application code or rules.


The addDays() functions evaluates input and calculate results in three steps:

  1. Evaluate a DateTime value for the starting date.
    • The date specified is evaluated to determine if the date is a business day. (The time of day is not evaluated.)
    • If the specified day is a business day, then that date is used for calculation.
    • If the specified day is not a business day, then the date is rolled forward, using the calendar provided, to the next business day.
​​The date resulting from this step, which is used in the following steps, might not be the original date specified, the date rolls forward and you see one day extra.

Published February 11, 2016 - Updated October 8, 2020

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