Instructions for enabling and configuring the day/night cycle option are at the top of the file. It is very easy for server owners to configure. Instead of performing a 307 hive call, this file uses the date stored in ServerCurrentTime that is updated every 60 seconds in sched_event. dayz_storeTimeDate is used in server_sendToClient to respond to client date requests sent by player_monitor. It was undefined on the server. The saving grace is the redundancy in publicVariable sends by the server. The client was bound to get the correct date eventually.
It makes no sense to rename the identical DayZ PVs to have an E in their
name. I don't see any good reason it was done in the first place. All it
accomplishes is breaking script compatibility between the two mods and
requiring different publicvariable.txt filters. The only time it makes
sense is for custom Epoch variables that aren't used in vanilla.
All admins have to do to update custom scripts is swap the names
according to the change log.
Note I've submitted a pull request to replace PVDZ_veh_Save with
PVDZ_obj_Save in official too because they are duplicates.