Improved time zone valid cache to work for all instances.
Improved time zone valid cache to work for all instances.

MBRG/otrs,crythias/otrs,rudy500/otrs,s7design/otrs,s7design/otrs,crythias/otrs,rudy500/otrs,xhoy/otrs,s7design/otrs,xhoy/otrs,MBRG/otrs,rudy500/otrs,xhoy/otrs,rudy500/otrs,crythias/otrs,MBRG/otrs,s7design/otrs,MBRG/otrs,MBRG/otrs,crythias/otrs,xhoy/otrs,mburggraf/otrs,mburggraf/otrs,rudy500/otrs,s7design/otrs,crythias/otrs,mburggraf/otrs,mburggraf/otrs,mburggraf/otrs,xhoy/otrs