We have these two test days defined in our QA calendar:
i18n Test Day, https://apps.fedoraproject.org/calendar/QA/2014/9/1/#m764
Wayland Test Day, https://apps.fedoraproject.org/calendar/QA/2014/9/1/#m420

Both of them look like a single full-day event in Fedocal, and even in Zimbra and Evolution. But in Google Calendar, only Wayland looks like a single day, and i18n looks like spanning two days (with an indication that it's from 2AM first day to 2AM second day). Look at the attachment.

They both seemed to be stored the same way:
{{{
Stored as:

Start: 2014-09-02 - 00:00:00 UTC
End: 2014-09-03 - 00:00:00 UTC

}}}
and
{{{
Stored as:

Start: 2014-09-04 - 00:00:00 UTC
End: 2014-09-05 - 00:00:00 UTC

}}}

ical export says:
{{{
BEGIN:VEVENT
UID:20140825T134824Z-55530@fedocal01.phx2.fedoraproject.org
DTSTART;VALUE=DATE:20140902
DTEND;VALUE=DATE:20140903
DESCRIPTION:This is temporary placeholder meeting\, it will be updated<
/i>\n\nWe will test Wayland in upcoming Fedora 21.\n
LOCATION:fedora-test-day@irc.freenode.net
ORGANIZER:lbrabec\, pschindl
SUMMARY:i18n Test Day
TRANSP:TRANSPARENT
END:VEVENT
}}}
(there is a wrong description, but I don't want to touch it, because it might "fix" the bug:))
and
{{{
BEGIN:VEVENT
UID:20140825T134824Z-37071@fedocal01.phx2.fedoraproject.org
DTSTART;VALUE=DATE:20140904
DTEND;VALUE=DATE:20140905
DESCRIPTION:This is temporary placeholder meeting\, it will be updated\n
\nWe will test Wayland in upcoming Fedora 21.\n\n
LOCATION:fedora-test-day@irc.freenode.net
ORGANIZER:kparal\, lbrabec\, pschindl
SUMMARY:Wayland Test Day
TRANSP:TRANSPARENT
END:VEVENT
}}}