I never really noticed this before, but the jumpbox admin does not seem to allow daylight saving tzconfig/tzselect type functionality. (maybe i missed it)
On recent ubuntu jumpboxes i've had to drop into ssh and do
'$sudo dpkg-reconfigure tzdata'
and select from there. perhaps this is related to my vm host setup on the various hardware we use. luckily i'm gmt+1 so the odd hour is not causing many problems when i dont remember to change it, but i noticed it with a backup/restore problem recently, lickily easily resolved.
so..whats the suggested approach with DST on a jumpbox vm guest.
PS: I just love the Jumpbox simplicity - it has saved me hours and hours generally in the lab.