Here we would like to draw your attention to STZEC transaction code in SAP. As we know it is being used in the SAP BC-SRV (Basis Services / Communication Interfaces in Basis) component which is coming under BC module (BASIS).STZEC is a transaction code used for Time zone mapping in ext. systems in SAP.
It comes under the package SZTZ.
Transaction STZEC technical data table
|Purpose||Time zone mapping in ext. systems|