SSRS Date parameter function - Mid Month

We run a report every month.. 1-15th and then 16th-EOM..

I want to have the report calculate the start & end date parameter based on the day..

So if I open the report between the 1-15 it will put for this month.. 11/1/2015 start date and 11/15/2015 end date.  After the 15th.. 11/16/2015-11/30/2015 (EOM).

I was going to use an iif statement to find the day then use something like this.  

=FormatDateTime(DatePart("m",Now()) & "/16/" & DatePart("yyyy",Now()), DateFormat.ShortDate)

when I put that in the expression of the parameter I get an invalid type.

Any help is appreciated.  Thanks.
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DMTechGrooupAsked:
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DMTechGrooupAuthor Commented:
=IIf(DatePart("m",Now()) > 15,CDate(DatePart("m",Now()) & "/16/" & DatePart("yyyy",Now())), CDate(DatePart("m",Now()) & "/1/" & DatePart("yyyy",Now())))

=IIf(DatePart("m",Now()) < 16,CDate(DatePart("m",Now()) & "/15/" & DatePart("yyyy",Now())), DateSerial(Year(Now()), Month(Now()), "1").AddMonths(1).AddDays(-1))
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