I am doing a Vlookup and it is returning 0 if there is a blank for that date but i want it to return the blank so when i take the average the blanks are not lowering the average with the zeros
If Debraj Roy weren't so perceptive and discerning it'd have been difficult for anyone who might read this to hit the mark with the provided info. Posting the link to sample file, copying & pasting values and formulas, specifying a couple of examples, that will surely help people to aid you better.
Take care of the differences between Debraj Roy's and shrivallabha's solutions: 1st one actually leaves a blank ("") as cell value while 2nd still leaves a zero (0) but displayed format edited.
Even if both are visually the same, as per your requirements shrivallabha's solution won't give you the right average.