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FirstDayOfMonth
Last update:
May 18, 2026
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 that corresponds to a day-number in a year.
Category
Function syntax
FirstDayOfMonth(date) |
See also
Parameters
Parameter | Description |
date | Date/time object, in the range 100 AD–9999 AD. |
Usage
When passing a date/time value as a string, enclose it in quotation marks. Otherwise, it is interpreted as a number representation of a date/time object.
Example
<cfscript>
Date1 = "{ts '2018-12-06 12:13:50'}";
FirstDayOfMonth= FirstDayOfMonth(Date1)
year = (Date1)
writeOutput("The first day of month in " & year & "<br/>")
writeOutput("falls on day number " & FirstDayOfMonth)
</cfscript>Output
The first day of month in {ts '2018-12-06 12:13:50'}
falls on day number 335
falls on day number 335
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