Hello @NOLABrad ,
At this time the Birthday and Anniversary date fields are not available as selectable columns for viewing or sorting in the contacts dashboard. I've tracked your account as being interested in such a feature being developed, and submitted it to the devs for further review. If and when they have an update regarding this feature request, they'll notify you directly.
At this time the only workaround would be to export all of your contacts with at least the email address and birthday fields selected, use your spreadsheet program to sort them based on birthday date, and then fill in info for those missing it. You can then re-import that updated file, which will update the existing contacts with that new info. If you don't already have a list where all of your contacts are, you can create a list to dump everyone into for the sake of the re-import, then delete-the-list-only afterwards if you don't want it among your others.
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