When filtering incidents in the "All Channels" section, the "Older Than" date filter only works for days.
If you select any "Date" option other than "Days" in the dropdown list, the report will revert to "Days" when the filters are applied.
This is the same for the "Not Updated In" date option as well.
DLP 16.0, 16.0 MP1, 16.0 MP2, 16.0 RU1
This will be fixed in 16.0 RU2 and 17.0.