We have received reports from our customers that they would like to add a filter criteria for membership expires on "date". Currently, there is a membership started on, but there isn't an expires on. This would be helpful as an additional membership renewal email to invite your expiring members to renew earlier than the normal expiration date.
We have added this feature to NationBuilder! You can filter for "Membership expires on" by going to People > Filter > Add Criteria > Support Level > Membership expires. From there, you can filter using a date range or specific dates accordingly.