## Create the 'date manipulation' string for the DateCalc Function:
   #        *The user's input is called $end_timeSpan...
   my $date_manip = "in $end_timeSpan"

   # For this example lets say:
   #       $current_time == "07/17/2013 10:30:00"

   ### Calculate the future date from the $current_date:
   #      *Output from function is in the form:
   #           "2013071811:00:00" --> YYYYMMDDHH:MM:SS
   my $future_date = DateCalc($current_date,$date_manip)

   # After running the above & capturing each piece from DateCalc, the
   # $future_date == "07/17/2013 11:00:00", which would be 30 mins 
   # from the $current_date.