Chenged String method for Datetime struct
Chenged String method for Datetime struct

After modification method returns hour, minute and second
even if they all are zero.

CodyGuo/mymysql,mikespook/mymysql,jnewmano/mymysql,albertjin/mymysql,mikespook/mymysql,jnewmano/mymysql,albertjin/mymysql,CodyGuo/mymysql