analyze the time we found that ,all the time of bill is same with time zone of GMT+8 ,so maybe the worng time zone cause this issue .
we check the time zone in UIDB ,with command :select * from t_dbtimezone t , and found that the time zone was GMT+8
we modify it to the same timezone of customer .
we check the timezone setting in bir report system ,and find that customer didn't configure the time zone for report .
in configure report ,we modify it .
after this ,when we check the bill in report ,all the time were correct now .