Israel just changed their DST this last Friday. CWMS shows +3 GMT but is should be +2 GMT.
Seems to be a system setting.
Does this require a patch, update etc...?
There is a bug for this issue: CSCus29466 Scheduling OL meeting with Israel TZ causes 1 hour diff on meeting site.
This bug is resolved in CWMS 2.5 MR2 (and later) and CWMS 2.0 MR7.
If you are on CWMS 2.0 version level, download 2.0 MR7 (cisco-webex-meetings-server-220.127.116.117.B.iso) from cisco.com and update your system.
If you are on CWMS 2.5 version level, download 2.5 MR2 or later from cisco.com and update your system.
I hope this helps.