EOMONTH - Daxplained

EOMONTH is a DAX function that returns the last day of the month a specified number of months before or after a given date.

Syntax

EOMONTH(
   StartDate,
   Months
)

Argument	Properties	Description
StartDate		The start date in datetime format.
Months		The number of months before or after the start_date.

A date (datetime).

In contrast to Microsoft Excel, which stores dates as sequential serial numbers, DAX works with dates in a datetime format. The EOMONTH function can accept dates in other formats, with the following restrictions:
If start_date is not a valid date, EOMONTH returns an error.
If start_date is a numeric value that is not in a datetime format, EOMONTH will convert the number to a date. To avoid unexpected results, convert the number to a datetime format before using the EOMONTH function.
If start_date plus months yields an invalid date, EOMONTH returns an error. Dates before March 1st of 1900 and after December 31st of 9999 are invalid.
When the date argument is a text representation of the date, the EDATE function uses the locale and date time settings, of the client computer, to understand the text value in order to perform the conversion. If current date time settings represent a date in the format of Month/Day/Year, then the following string “1/8/2009” is interpreted as a datetime value equivalent to January 8th of 2009. However, if the current date time settings represent a date in the format of Day/Month/Year, the same string would be interpreted as a datetime value equivalent to August 1st of 2009.
This function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.

The following expression returns May 31, 2008, because the months argument is rounded to 2.

= EOMONTH("March 3, 2008",1.5)

Other functions related to EOMONTH are:

Contribute » | Contributors: Rick de Groot
Microsoft documentation: https://learn.microsoft.com/en-us/dax/eomonth-function-dax