Incorrect time zone In Sap System

System was set in a incorrect time zone. How can I change it back?
Use T-code STZAC.
How can we delete the entries from DBTABLOG using RSTBPDEL report, it is not delete any records, even i tried we Dialog mode and background mode also. But it is not deleting any record from dbtablog table.
1. Check you have the right authority to delete the records 2. Make sure you have the variant specifications correct as regards date fields, try using a dynamic variant by date or specify a specific table.
3. Try RSTBCOUNT to check the content and discover which tables contribute the highest change logs
Query-: I want to do the settings in SR13 as per the language I have logged in: eg: If I have logged in through Eng language, online manual should open with eng If I have logged in through dutch language, online manual should open with dutch. Current settings are for Eng lang, I tried to maintain setting for dutch language. But its giving me following error :
E:H2:718 WIN32 How can it be done?
Ans-: just add an entry in SR13, but put the Lagnauge Field to DE and adapt the URL/link accordingly. Q-: Why this error accur
Cannot find PDL type for output device '(Printer name)'
Ans-: Its depend on Host Access type? 'F' or 'G' if you are using G then change it with F or if using F then change it with G
Q-: We are using SAP ECC6 with EHP 4 with SAP GUI 7.2. we have a strange problem with many users (Not All).
Session of few users auto logout after few minutes if remain idle. However this is not happening with many other users. We have checked with our basis and network team and they have not set any auto logout policy. This is happening with only few users and most of the users remain logged in even after being idle for hours. We are on windows 7.
Ans-: Asking different affected users, is the length of the 'idle time' consistent before the disconnect message (i.e. always 5 minutes) or does it vary (sometimes 5 minutes, sometimes 15 minutes, sometimes 30 minutes,
2-: check logs in work directory
If you want to find ping or tracert to IP address of sap server. If there is a loss in packet it will show you RTO.