oracle-oravclesql语句转换为mysqlsql语句

请问在oracle中的插入语句是
insert into ACT_HI_ACTINST (ID_, PROC_DEF_ID_, START_TIME_)values ('2698', 'M0008C020:3:12504',to_timestamp('20-03-2015 14:31:17.274000');
若换到mysql中那个to_timestamp()那段该怎么替换