get method
通用 getter,按单位获取值
Implementation
int get(DateLocationEnum unit) {
switch (unit) {
case DateLocationEnum.year: return year;
case DateLocationEnum.month: return month;
case DateLocationEnum.day: return day;
case DateLocationEnum.hour: return hour;
case DateLocationEnum.minute: return minute;
case DateLocationEnum.sec: return second;
case DateLocationEnum.millisecondsSinceEpoch: return valueOf!;
}
}