Let's say I type in 7/1/2011 into cell A1. I autofill/drag down the grippie and the cells beneath fill with an incremental days.
Is there a way to autofill by week? In other words, cell A2 should be 7/8/2011, cell A3 should be 7/15/2011 and so on.
Edit: fixed omission mentioned by @jonsca