String Date Calculate

As Seeing DateValue is String the Difficule to Calculate Follow Convert to Date(number) if Formula Want Below Method

   Hi ! Here Suggest to you

DataSheet= UseFormula   [ How Calculate Date( is STRING ) ] Let's Look & Find
1  2  3  4  5  6  7	A B C D E F Cell Format m/d/yyyy Calculete Dec-21-2008 Dec-31-2008 10 =B2-A2 Dec-21-2008 Mar-01-2009 70 =B5-A5 Cell Format String( Text ) Start End Calculete Dec/21/2008 Dec/31/2008 #VALUE! 21/Dec/2008 31/Dec/2008 10 Dec/21/2008 Mar/01/2009 #VALUE! 21/Dec/2008 01/Mar/2009 70

Used Formula ...(With Running MicrosoftExcel Ver 2003)
No	Addr'	If use below Formula, You'll Get Result as Right	Result	Etc
1	C2	=B2-A2	10
2	C3	=B3-A3	70
3	C6	=B6-A6	#VALUE!
4	C7	=B7-A7	#VALUE!
5	D6	=MID(A6,FIND("/",A6)+1,LEN(A6)-FIND(RIGHT(A6,5),A6)-1)&LEFT(A6,FIND("/",A6))&RIGHT(A6,4)	21/Dec/2008
6	D7	=MID(A7,FIND("/",A7)+1,LEN(A7)-FIND(RIGHT(A7,5),A7)-1)&LEFT(A7,FIND("/",A7))&RIGHT(A7,4)	21/Dec/2008
7	E6	=MID(B6,FIND("/",B6)+1,LEN(B6)-FIND(RIGHT(B6,5),B6)-1)&LEFT(B6,FIND("/",B6))&RIGHT(B6,4)	31/Dec/2008
8	E7	=MID(B7,FIND("/",B7)+1,LEN(B7)-FIND(RIGHT(B7,5),B7)-1)&LEFT(B7,FIND("/",B7))&RIGHT(B7,4)	01/Mar/2009
9	F6	=E6-D6	10
10	F7	=E7-D7	70
How about this suggest?