import java.util.Calendar;
import java.util.Date;

public class DateUtil {
    
    /**
     * 獲取指定天的開始時間
     * @return
     */
    public static Date getStartTimeOfCurrentDay(Date date){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.setTime(date);
        setMinTimeOfDay(calendar);
        
 
return calendar.getTime();
    }

    /**
     * 獲取指定天的結束時間
     * @return
     */
    public static Date getEndTimeOfCurrentDay(Date date){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.setTime(date);
        setMaxTimeOfDay(calendar);
        return calendar.getTime();
    }

    
 
/**
     * 獲取指定周的開始時間
     * @return
     */
    public static Date getStartTimeOfCurrentWeek(Date date){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.setTime(date);
        calendar.setFirstDayOfWeek(Calendar.MONDAY);
        calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        setMinTimeOfDay(calendar);
        
 
return calendar.getTime();
    }

    /**
     * 獲取指定月的結束時間
     * @return
     */
    public static Date getEndTimeOfCurrentWeek(Date date){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.setTime(date);
        calendar.setFirstDayOfWeek(Calendar.MONDAY);
        calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
        setMaxTimeOfDay(calendar);
        return calendar.getTime();
    }

    /**
     * 獲取指定月的開始時間
     * @return
     */
    public static Date getStartTimeOfCurrentMonth(Date date){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.setTime(date);
        calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),1);
        setMinTimeOfDay(calendar);
        return calendar.getTime();
    }

    /**
     * 獲取指定月的結束時間
     * @return
     */
    public static Date getEndTimeOfCurrentMonth(Date date){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.setTime(date);
        int maxMonthDay = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
        calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),maxMonthDay);
        setMaxTimeOfDay(calendar);
        return calendar.getTime();
    }

    /**
     * 獲取指定年的開始時間
     * @return
     */
    public static Date getStartTimeOfCurrentYear(Date date){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.setTime(date);
        calendar.set(calendar.get(Calendar.YEAR),1,1);
        setMinTimeOfDay(calendar);
        return calendar.getTime();
    }

    /**
     * 獲取指定年的結束時間
     * @return
     */
    public static Date getEndTimeOfCurrentYear(Date date){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.setTime(date);
        calendar.set(calendar.get(Calendar.YEAR),12,31);
        setMaxTimeOfDay(calendar);
        return calendar.getTime();
    }
    
   /**
     * 設定當天的開始時間
     * @param calendar
     */
    private static void setMinTimeOfDay(Calendar calendar) {
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.MILLISECOND, 0);
    }

    /**
     * 設定當天的結束時間
     * @param calendar
     */
    private static void setMaxTimeOfDay(Calendar calendar) {
        calendar.set(Calendar.HOUR_OF_DAY, 23);
        calendar.set(Calendar.SECOND, 59);
        calendar.set(Calendar.MINUTE, 59);
        calendar.set(Calendar.MILLISECOND, 999);
    }
    

}