User Guide

476 Chapter 3: ColdFusion Functions
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
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>
Parameter Description
date Date/time object, in the range 100 AD–9999 AD.