1. Create an Object for cl_i18_calendar_greg.
2. Pass a month in the GETSHORTMONTHNAME IM_MONTH Type number by Exporting Parameter and get the result in Importing Parameter.
DATA: lv_mon TYPE fcktx, lv_nmon TYPE i, lo_cal TYPE REF TO cl_i18_calendar_greg. lv_nmon = SY-DATUM. CREATE OBJECT lo_cal EXPORTING im_lang = sy-langu . lo_cal->getshortmonthname( EXPORTING im_month = lv_nmon IMPORTING ex_month_name = lv_mon ).