Here is the cartridge for you to take a look at.  [URL]
I've been working on a little dashboard that you can use to find VMs that were created given a specific date range.  It takes all the VMs, finds the ones between a set of dates and shows on a table.  It looks at everything right now, but I'm curious if others would want to filter that down still by vCenter/Cluster etc...  Thoughts? [IMAGE]
VM Creation Dates (Birthdays)