日期格式转换的函数
1. CONVERSION_EXIT_IDATE_OUTPUT
INPUT: 20080203
OUTPUT: 03FEB2008
2. CONVERT_DATE_TO_EXTERNAL
INPUT: 20080203
OUTPUT: 02/03/2008 "According to user's default setting.
3. CONVERT_DATE_TO_INTERNAL
INPUT: 02/03/2008 "Should be same as the user's default setting
OUPUT: 20080203
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