How should I entitle date columns?
Chose a name that is unambiguous. created could mean the following things:


"was created yes/no" (a boolean value)
the "object" that was created, maybe the name of it as a string
the datetime when it was created


Probably more. deliveredAt has similar problems. It could be the location where a parcel was delivered at. I really hate these ambiguous naming schemes.

If you just name it createDateTime all ambiguity is gone. The point here is not to add the type to the name. The point is to not leave the name open to interpretation what it means.