[Link] Timezone changes best practices

---

http://wiki.scn.sap.com/wiki/display/Basis/Timezone+changes+best+practices

How to check the timezone at different levels

Login to SAP system client  
Run the report from Tcode SA38   -> TZCUSTHELP
Run the report from Tcode SA38   -> RSDBTIME
Run this function module in SE37   -> TZ_SYSTEM_GET_TZONE
Run this report from Tocde SA38  -> TZONECHECK