MS Excel 2013 - PowerPivot - DAX How to compare today's date to another dates

Hi All,
I have records in 3 tables of student and course

CourseID coursename   startdate                   enddate
   1             maths             06/26/2014               07/27/2014

 CourseStudentAssignment

CourseId   studentId     CourseStatus (computed column)
  1                 1  

I want to create a formula which checks the  startdate and enddate comparing to today's date

for eg :  If( Today'sdate > StartDate and today'sdate < endDate then CourseStatus = "On-going Course")
              if (Todays'Date < startDate then CourseStatus = "Not Started but student enrolled")
             If (Today'sDate > enddate then courseStatus  "Course completed")

please can you write down how to compare the above date to today's date.
BI 0824Asked:
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Rory ArchibaldCommented:
Assuming you have the relationships set up between the tables, it would be something like:

=if(TODAY()>=related(Course[startdate]),if(today()<=related(Course[enddate]),"On-going Course","Course completed"),"Not Started but student enrolled")

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BI 0824Author Commented:
Thanks Rory. Appreciate that. I also posted another question in same section.
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