I just tested in version 3.7 and see the behavior Andrea describes. I adjusted the date format to MM-dd-yyyy in the library settings, and that didn't appear to affect the need to use a YYYY-MM-DD when creating a subscription on this sandbox. I'm wondering if the format issue is partially related to https://bugs.launchpad.net/evergreen/+bug/1843917
I just tested in version 3.7 and see the behavior Andrea describes. I adjusted the date format to MM-dd-yyyy in the library settings, and that didn't appear to affect the need to use a YYYY-MM-DD when creating a subscription on this sandbox. I'm wondering if the format issue is partially related to https:/ /bugs.launchpad .net/evergreen/ +bug/1843917