SSRS - DateValue

Question

in SSRS, i am trying to return a DateValue that is the first day of the next month after the selected month/year. Everything works with my formula except when i try to evaluate on the month of December. The formula works for all other months (evaluating on "4" yields an output of 1/1/(year selected +1) for example), but December returns a #Error every time.

My formula is:

=IIF(Parameters!Month.Value="12",(DateValue("1" & "/" & Parameters!Year.Value+1)),(DateValue(Parameters!Month.Value+1 & "/" & Parameters!Year.Value)))

Answer 1

I would look at using DateAdd and DateSerial.

So an expression like:

=DateAdd(DateInterval.Month
  , 1
  , DateSerial(Parameters!Year.Value, Parameters!Month.Value, 1))

This uses DateSerial to construct the first of the month for the selected Year and Month, then uses DateAdd to add another month to this.

Worked fine on a basic report I made to test the expression:

Answer 2

I don't recognize DateValue(), but don't you mean to include the day, as well as the month and the year?

=IIF(Parameters!Month.Value="12",(DateValue("1/1/" & Parameters!Year.Value+1)),(DateValue(Parameters!Month.Value+1 & "/1/" & Parameters!Year.Value)))

You could also use CDate(datestring) to convert a string into a date. See SSRS Expressions and Type Conversion Functions.

Answer 3

IIf and Switch always evaluate all paths, so for December this part of the formula

DateValue(Parameters!Month.Value+1 & "/" & Parameters!Year.Value)

fails, because Parameters!Month.Value+1 would be 13 and there is no 13th month. To avoid this you have to change that part to something like this:

DateValue(IIf(Parameters!Month.Value<12,Parameters!Month.Value+1,12) & "/" & Parameters!Year.Value)

It will never be displayed for December but still be evaluated.