Outlook and 18 hour setting

[Guest]

When a delegate sets an all-day appointment on this principal's calendar,
Outlook sets it on two different days: the actual all-day appointment date
and the previous date. On the delegate's screen, when she looks at the
principal's calendar, the appointment shows up only on the day it is set for.
On his screen, it shows up on two different days, leading to his confusion
as to which day is the real appointment.

It doesn't make any difference if we remove the "reminder" option (which
shows as 15 minutes on the delegate's view of his Outlook calendar and 18
hours when the appointment is viewed on his screen). The appointment still
shows up on his Outlook as spanning two days.

How do we stop this? (And, no, we can't just set it as an appointment on
that day from 8 to 5. He doesn't want it to look that way.)

 

[Brian Tillman]

When a delegate sets an all-day appointment on this principal's
calendar, Outlook sets it on two different days: the actual all-day
appointment date and the previous date. On the delegate's screen,
when she looks at the principal's calendar, the appointment shows up
only on the day it is set for. On his screen, it shows up on two
different days, leading to his confusion as to which day is the real
appointment.

One of the two PCs differs in either the Time Zone or the daylight saving
time setting.