How to calculate months & days between two dates??

HOW TO CALCULATE MONTHS & DAYS BETWEEN TWO DATES??
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I have a table, having range of dates, like:

DD-MM-YYYY TO DD-MM-YYYY
01/01/2006 TO 30/06/2006
15/07/2006 TO 31/12/2006
24/03/2007 TO 30/06/2007
31/07/2007 TO 31/12/2007

Dates are in column A & B.
Column C = Months
Column D = Days

IN COLUMN C, having this formula:-
=DATEDIF(A2,B2+1,"M")

IN COLUMN D, having this formula:-
=DATEDIF(A2,B2+1,"MD")

THE ABOVE TABLE SHOWING THIS RESULT:











IN ALL THE CASES MONTHS (COLUMN C) ARE CORRECT.
BUT DAYS ARE SHOWING WRONG: IN CASE2,3,4,5

RIGHT DAYS SHOULD BE LIKE THIS:-
CASE 2 = 17 DAYS
CASE 3 = 5 DAYS
CASE 4 = 14 DAYS
CASE 5 = 7 DAYS

PLZ HELP, WHAT IS THE PROBLEM IN ABOVE FORMULAS.
PLZ SUGGEST WHAT FORMULA SHOULD I USE??

THANX IN ADVANCE!!

This gives the results that you show

=N(DATEDIF($B2,$C2,"YM")+AND(DAY($C2)=DATEDIF($B2,$C2,"MD")+1,MONTH($C2)<>MONTH($C2+1)))

=(DATEDIF($B2,$C2,"MD")+1)*(NOT(AND(DAY($C2)=DATEDIF($B2,$C2,"MD")+1,MONTH($C2)<>MONTH($C2+1))))