If you have dates in A2 and B2 then you can get the number of weeks between those with this formula in C2
=INT((B2-A2)/7)&" weeks "&MOD(B2-A2,7)&" days"
for the total it's best to use a similar formula working off the original dates (rather than the previous formula results) so for dates in rows 2 to 7 get the total with this formula
=INT((SUM(B2:B7)-SUM(A2:A7))/7)&" weeks "&MOD(SUM(B2:B7)-SUM(A2:A7),7)&" days"
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