PREVIOUS MONTH returns blank

[FranckGbadamass]

Hello experts,

I want to retrieve the nb_conv_int for the last month so I used PREVIOUS MONTH as you can see below:

Nb_conv M-1:=CALCULATE([Nb_conv_inter];PREVIOUSMONTH(Date_table[Date]))

But, it returns blank value:

I don't know what's going wrong. Here is my data (if you want to help)

Below my data model:

Thanks in advance.

[daXtreme]

I wouldn't use PREVIOUSMOTH as it does not work the way people would expect it to. Instead, use a different function, DATEADD, that does work the way you'd expect. If you want to know how the functions differ, please go to https://dax.guide/previousmonth and https://dax.guide/dateadd and see the examples there (they're interactive).

[v-jianboli-msft · Accepted solution]

Hi @FranckGbadamass ,

In order to use any time intelligence calculation, you need a well-formed date table. The Date table must satisfy the following requirements:

• All dates need to be present for the years required. The Date table must always start on January 1 and end on December 31, including all the days in this range. If the report only references fiscal years, then the date table must include all the dates from the first to the last day of a fiscal year. For example, if the fiscal year 2008 starts on July 1, 2007, then the Date table must include all the days from July 1, 2007 to June 30, 2008.
• There needs to be a column with a DateTime or Date data type containing unique values. This column is usually called Date. Even though the Date column is often used to define relationships with other tables, this is not required. Still, the Date column must contain unique values and should be referenced by the Mark as Date Table feature. In case the column also contains a time part, no time should be used – for example, the time should always be 12:00 am.
• The Date table must be marked as a date table in the model, in case the relationship between the Date table and any other table is not based on the Date.

The result of time intelligence functions has the same data lineage as the date column or table provided as an argument.

Note: The result table includes only dates that exist in the dates column.

Please check your Date column, or use something to replace the PREVIOUSMONTH fumction:

Nb_conv M-1 = CALCULATE([Nb_conv_inter],Filter('Date_table',[Date]<=EOMONTH(MAX('Date_table'[Date]),-1)&&[Date]>=EOMONTH(MAX('Date_table'[Date]),-2)+1))

Best Regards,

Jianbo Li

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