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To explain how to import the current timezone data.
You require current time zone data or you want to make Customizing settings for time zones. How to do that?
Run TZCUSTIM report and import TZ*.zip file. This ZIP file contains all data and reports for maintaining and analyzing the time zones. Extract this ZIP file to a separate directory. Then, open the file readme.html using an HTML browser. The file contains all further information. The ZIP file is attached to SAP note 198411.
Important: run the report in every client. Otherwise CONVERT_TSTMP_INCONSISTENT_TAB may occur (see SAP note 200827).
SAP Note 198411: Current data and information about time zones
SAP note 200827: Time zone data is determined from different clients