clear
input double date str56 country
21934 "韩国"
21935 "韩国"
21936 "韩国"
21937 "韩国"
21942 "韩国"
21943 "韩国"
21944 "韩国"
21945 "韩国"
21948 "韩国"
21949 "韩国"
21938 "中国"
21948 "中国"
21949 "中国"
21950 "中国"
21951 "中国"
21952 "中国"
end
format %tdNN/DD/CCYY date

date为日期，country为国家