FirstDayOfMonth  
Description
Determines the ordinal (day number, in the year) of the first day of the month in which a given date falls.
 
Returns
A number corresponding to a day-number in a year.
 
Category
Date and time functions
 
Function syntax 
FirstDayOfMonth(date)
 
See also
Day, DayOfWeek, DayOfWeekAsString, DayOfYear, DaysInMonth, DaysInYear
 
Parameters
 
Parameter      Description
date Date/time object, in the range 100 AD-9999 AD.
 
Usage
When passing a date/time value as a string, you must enclose it in quotation marks. Otherwise, it is interpreted as a number representation of a date/time object.
 
Example
<h3>FirstDayOfMonth Example</h3>

<cfoutput>
The first day of #MonthAsString(Month(Now()))#, #Year(Now())# was 
day #FirstDayOfMonth(Now())# of the year.
</cfoutput>
date  
Date/time object, in the range 100 AD-9999 AD.