how to convert number to date

i have number in database 1 and want to convert as date in database 2

040792 19920506
040892 19920507
040992 19920510
187301 20010729
187401 20010801
187501 20010804
187601 20010805


result in database 2

407/92 06/05/1992
408/92 07/05/1992
408/92 10/05/1992
1873/01 29/07/2001
1874/01 01/08/2001
1875/01 04/08/2001
1876/01 05/08/2001

is it got any formula to convert this number from database 1 to database 2, so far i am doing manual.please help me thanks in advance
i has attach sample files..

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Try in G5:

=REPLACE(B5,4,0,"/")

and in H5:

=DATE(LEFT(C2,4),MID(C2,5,2),RIGHT(C2,2))

its solved sir.thank u very much...

Should be:

=DATE(LEFT(C5,4),MID(C5,5,2),RIGHT(C5,2))