mysql把字符串转成时间格式的示例：
假如查询demo表的数据为：
+------------------+| DueDate |
+------------------+
| 11/02/2019 10:35 |
| 21/12/2018 12:01 |
+------------------+
2 rows in set (0.00 sec)
将表中字符串转成时间格式的语法：
select demo(DueDate,'%d/%m/%Y %h:%i %p') as ConvertDate from DemoTable;得到结果：
+---------------------+| ConvertDate |
+---------------------+
| 2019-02-11 10:35:00 |
| 2018-12-21 00:01:00 |
+---------------------+
2 rows in set (0.00 sec)
