{{tag>Index Function Function_List Date_And_Time}}
====== FIRST_DAY_OF_PREV_MONTH ======

===== Description ===== 
Calculates the date corresponding to the first day of the previous month of the provided date
===== Parameters ===== 
Attribute of the Date type or date constant or calculation producing a date
===== Example ===== 
<code aim>IF FIRST_DAY_OF_PREV_MONTH (Account.OpeningDate=01/09/2004) THEN ... </code>