I wrote:
Fedora:
> Beta and Final freezes are in effect from 00:00 UTC of the freeze day.
KDE:
> All deadlines are due 23:59 UTC, but if you need a few more hours, notify
> someone from the release team.
PS: The deadlines I encountered for academic CfPs were also KDE style (23:59
in a specified time zone), or in very rare occasions at a specified time
during the say, e.g., noon (12:00), but never Fedora style (00:00).
Kevin Kofler