1 The first thing we have to do before performing a cohort analysis is divide our users into cohorts based on what we call their "activation date".
2 Wouldn't it be nice if we could format the activation_date so that `2011-05-05 16:18:32` would become `04:18 PM Thu 05 May 2011`?
3 Now that we have the activation date for each user, we want to extract more data on all the payments that our users made so that we can start analys..