"all_day?" exploding because @start_time was a Time instead of String

[henrik]

We got an exception from "all_day?" because @start_time was a Time instead of a String.

I think this can be reproduced with something like

event = some_all_day_event
event.start_time  # Now @start_time is assigned a Time due to how that reader works.
event.all_day?  # Now it explodes