If you use NTP you will likely get short dumps due to the time being changed on the system. At present SAP systems cannot handle timechanges while the system is online due to the timestamps being changed on locks.
If NTP can perform soft adjustment of time it should avoid the problems of time dumps due to large time changes. Tuning the time changes so that the increments are small enough to avoid timestamp issues is vital.
To get over the problem for now Restart db and the application servers. This should reset the time ok