====== MonthStart(date) ======
Category:  Date and Time function

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=====Description=====
This function returns the date serial number of the first day of the month //date// falls in.

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=====Arguments=====
^Argument^Type^Description^
|date|Date or Number (date serial)|An expression representing a date to derive the month's first day date value from.|

**Return value type:** Date serial number

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=====Remarks=====
The //date// argument can take any value or expression that evaluates to a date serial value.  Examples include:  
  * A date string:  #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.

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=====Examples=====

  monthstart(#2018-06-06)  //Returns 43252 (Equivalent to June 1st, 2018.)

  monthstart(#2020-01-28)  //Returns 43831 (Equivalent to January 1st, 2020.)

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=====See also=====
  * [[syntax:functions:month|Month(date_as_number)]]
  * [[syntax:functions:monthend|MonthEnd(date)]]
  * [[syntax:functions:monthname|MonthName(month_num)]]
  * [[syntax:functions:monthnamelocal|MonthNameLocal(month_num)]]