dax formula problem

[Stuk]

Hello ! i would like to create a column which give me the number of the week of the last appointement i have already tried  or 
but it's not working does anyone can help me?

[Sean]

@Stuk

When you say its not working - are you getting an error message OR not the result you want?

Also you may try ISBLANK ( Table[Column] ) instead of ISEMPTY ( Table )

[Stuk]

Thanks but i tell me " can't convert "" which is Text type into Date type"
the problem probably don't come from the formula

[Sean]

@Stuk

WEEKNUM works on dates!

Does the [Dernier RDV] column contain dates?

If it does select the Column and convert it to DATA TYPE: Date

This should resolve it!

[Stuk]

I can't convert it into Date ( actual Data type : Text) BUT in request editor the data type is Date

[Sean]

Did you try converting it? (click OK if you get a pop up warning forget what it says something discouraging you to convert...)

If it's really Data Type: Date in the Query Editor it should convert with no errors in the Modeling tab!