Hacker News Reader

Off the top of my head I can't think of a reason to check if a date exists, but I would certainly expect midnight to be truthy if I found a reason.

What about optional date fields in a Django application?

you check if it's None or for the type.

In Django you might have a nullable TimeField and check if it's set via "if obj.time_field".

I always write "if x is None", trying to be explicit.