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+====== MonthStart(date) ======
+Category:  Date and Time function
+\\
+=====Description=====
+This function returns the date serial number of the first day of the month //date// falls in.
+\\
+=====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
+\\
+=====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.
+\\
+=====Examples=====
+  monthstart(#2018-06-06)  //Returns 43252 (Equivalent to June 1st, 2018.)
+  monthstart(#2020-01-28)  //Returns 43831 (Equivalent to January 1st, 2020.)
+\\
+=====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)]]