Solution : https://service.sap.com/sap/support/notes/113312 (SAP Service marketplace login required)
Key words :
terms timezone sy-datum sy-uzeit sy-datlo sy-timlo reason, xx hours ahead system time zone, + system day day n-1 day, remain unconverted database server times, prerequisites time zone functionality, user day days, symptom time zones, change date/time, exact local date, database server
Related Notes :
15913 | Timezone problems (local vs. global time) |