DONE
- impl getCurDate func(copy localtime)
- impl getLocalTime func
- impl getLastDayOfMonth func
- impl SetError func
- impl getPreDay func
- impl unitest varifyYear func
- impl unitest varifyMonth func
- impl unitest varifyDay func
- impl unitest varifyHour func
- impl unitest varifyMin func
- impl unitest varifySec func
- impl unitest varifyWday func
- impl unitest varifyYday func
- impl unitest varifyIsdst func
- impl unitest varifyStructTm func
- impl unitest getPreDay() func exception
- impl unitest getLastDayOfMonth() func exception