The new Map Viewer (both AGOL and Enterprise) should have the ability to filter a layer's data by a date relative to the current date. For example, I have a layer of construction closures that have a start and endate as attributes. I want to apply a filter such that only records where the closing date occurs in the future would be displayed. With Map Viewer Classic, I believe you could edit the map's JSON in AGOL Assistant to implement this but I don't know if this is still possible with the new Map Viewer. Either way, users should have to hack their maps for a pretty standard date filter option.
The choices would be something like:
"occurs on.." <Specific Date | Today>
"occurs on or after.." <Specific Date | Today>
"occurs on or before.." <Specific Date | Today>
It would be nice to also have some addition variants like "within the next week | within the next month" but a relative option like "today" should be the absolute minimum.