R1:f3d76a90f0e3

Translate "All Day" events into the viewer's time

Summary:
Ref T8021.

- When "All Day" events are loaded, convert them into the viewer's time.
- When "All Day" events are saved, convert them into a +24 hour range.

Test Plan:
- Created and updated "All Day" events.
- Created and updated normal events.
- Changed timezones, edited and viewed "All Day" events and normal events.
- In all cases, "All Day" events appeared to be 12:00AM - 11:59:59PM to the viewer, on the correct day.
- Normal…