I am trying to create a formula in excel where i can track the date someone purchased a subscription vs. the date the subscription was activated. I am having trouble using the COUNTIF and SUMPRODUCT formulas because I want to see the data between date ranges. For example i have 10 subscriptions purchased all on 1/1/2011 (column A lists unique subscription ID, Column B lists date purchased, Column C lists date activated). For the first 10 subscriptions, 4 were activated on 1/1/11, 1 on 2/10/11, 1 on 2/15/11 and 1 on 2/28/11 and 3 on 6/30/11). I want to see how many were activated within January (4)February (3) and so on, but can't get the formula to spit out the conditions. Can anyone help with this?