Convert.ToInt32(datetimepicker.value.tostring("yyyy");//年
Convert.ToInt32(datetimepicker.value.tostring("yyyy-MM-dd");//年月日
Convert.ToInt32(datetimepicker.value.tostring("MM");//月
Convert.ToInt32(datetimepicker.value.tostring("dd");//日
int a = this.dateTimePicker1.Value.Year;
this.dateTimePicker1.Value.Year