DAX: Previousmonth / parallelperiod / dateadd doesn't work

Hi RemiAnthonise,

It looks like it's the TRansactionDate in your ProjectPostTransViews as it's a datetime field with a time of 12:00:00 midday. So when you link the Calendar table to it it will return no values as these are just the date that will assume midnight.

Create a new column in the ProjectPostTransViews table like;

TransactionDateOnly = date(year(ProjectPostTransViews[TransactionDate]),month(ProjectPostTransViews[TransactionDate]),DAY(ProjectPostTransViews[TransactionDate]))

then join on that.

And you will need to change what you grouping by in your matrix. So either create a new column on Calendar that is "maand nummer" or group by Jaar and Maand from Calendar.