You may have some issues with DateTime using hyphens vs slash (British vs American) and localeDate() - I know this is a huge problem when using date()/strtotime() as they will interpret based on the usage of hyphens or slash.
Just to keep in mind
No.
The correct avenue for such a topic would in fact be https://community.invisionpower.com/4bugtrack/
Which is monitored all throughout office hours of IPS
(If they are in-fact being uploaded sideways to what the original picture is)