Hi Naveen Kumar,
Try using the FM below as example and convert system timestamp to India or USA and fetch the times and populate your custom screen:
* The following function module is used to convert the
* time and date into GMT timestamp
CALL FUNCTION 'IB_CONVERT_INTO_TIMESTAMP'
EXPORTING
i_datlo = sy-datum
i_timlo = sy-uzeit
I_TZONE = 'INDIA'
IMPORTING
E_TIMESTAMP = timestamp.
* The following function module is used to convert the
* above obtained timestamp to PST time zone date and time.
CALL FUNCTION 'IB_CONVERT_FROM_TIMESTAMP'
EXPORTING
i_timestamp = timestamp
I_TZONE = 'PST'
IMPORTING
E_DATLO = date
E_TIMLO = time.
Hope this helps.