======Workdays(from_date, to_date, [exclude],[include]) ======
Category:  Date and Time function

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=====Description=====
This function returns the number of workdays (i.e. all days except Saturday and Sunday) between //from_date// and //to_date//. Both date boundaries are inclusive.
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=====Arguments=====
^Argument^Type^Description^
|from_date|Date or Number (date serial)|An expression representing the first date value to derive the number of workdays from.|
|to_date|Date or Number (date serial)|An expression representing the second date value to derive the number of workdays from.|
|exclude|Text|(Optional) Dates to exclude from the calculation.  This argument should appear as a list of comma-separated dates in text format, enclosed in quotes (i.e., "2020-11-26, 2020-04-24").|
|include|Text|(Optional) Dates to include in the calculation.  This argument should appear as a list of comma-separated dates in text format, enclosed in quotes (i.e., "2020-08-15, 2020-03-22").|

**Return value type:** Number

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=====Remarks=====
The //from_date// and //to_date// arguments can take any value or expression that evaluates to a date serial value.  Examples include:  
  * A date literal:  #2019-12-12
  * A date serial value: 43811 (the date serial for "2019-12-12")
  * A date value created using any of the Date/Time functions that returns a date serial value.

The //exclude// and //include// arguments need to be a date or list of dates, delimited by commas, enclosed in quotes, and appearing in yyyy-MM-dd format:
  * A single date: "2024-02-20"
  * List of 3 dates: "2023-04-01, 2023-07-22, 2023-10-31"
  * Use empty quotes ("") in the //exclude_dates// position if no dates will be excluded, but there are dates to be //included//.  See the last Example below.
  * A date serial value cannot be used (i.e., "43811").

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=====Examples=====

  workdays(#2020-05-01,#2020-05-20)  //Returns 14

  workdays(#2019-01-01,#2019-12-31)  //Returns 261 (The number of workdays in a non-leap-year year.)

  workdays(#2005-12-17, #2005-12-18)  //Returns 0 (The 17th is a Sat and the 18th is a Sun.)

  workdays(#2019-01-01,#2019-12-31,"2019-07-13","2019-07-26")  //Returns 261 (1 exclusion, 1 inclusion.)

  workdays(#2019-01-01,#2019-12-31,"2019-05-24,2019-06-28")  //Returns 259 (2 exclusions.)

  workdays(#2019-01-01,#2019-12-31,"","2019-06-29")  //Returns 262. (No exclusions, one inclusion.)