日期转换
String to Date 转化大全
https://blog.csdn.net/lin443514407lin/article/details/102824440
hive中的to_date和to_char
http://www.mamicode.com/info-detail-2916858.html
https://blog.csdn.net/lin443514407lin/article/details/102824440
http://www.mamicode.com/info-detail-2916858.html