I'm trying to add some datetime fields to my dataset, however these are milestone dates, so they may or may not exist for any given row. I've tried a few variations of null etc. but everything is rejected with some form of the following error:
The supplied value for "won_time" is not a datetime: <nil>
Do I have to do something like default these dates to the epoch and then filter with greater than in my widgets? Seems goofy when really I just need an empty field.