i want get 'JST'

IN SAP 4.7

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DATA : TIMEZONE_NAME(7) TYPE C.

CALL 'C_GET_TIMEZONE'

ID 'NAME ' FIELD TIME ZONE_NAME.

WRITE TIMEZONE_NAME.

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RESULT: JST

IN SAP 6.0

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DATA : TIMEZONE_NAME(7) TYPE C.

CALL 'C_GET_TIMEZONE'

ID 'NAME ' FIELD TIME ZONE_NAME.

WRITE TIMEZONE_NAME.

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RESULT: ####

If you run it with a different version, the result is different as above, but how can I get 'JST' in SAP 6.0?