Java根据当前日期获取年初，年末，季初，季末，月初，月末日期的方法

年初

	public static Date getYearFirst(){
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		Calendar c = Calendar.getInstance();
		c.clear(Calendar.MONTH);
		c.add(Calendar.YEAR, 0);
		/*c.add(Calendar.MONTH, 0);*/
		c.set(Calendar.DAY_OF_MONTH, 1);
		//设置为1号,当前日期既为本月第一天
		//c.set(Calendar.DAY_OF_MONTH, 1);
		//将小时至0
		c.set(Calendar.HOUR_OF_DAY, 0);
		//将分钟至0
		c.set(Calendar.MINUTE, 0);
		//将秒至0
		c.set(Calendar.SECOND, 0);
		//将毫秒至0
		c.set(Calendar.MILLISECOND, 0);
		String first = format.format(c.getTime());
		return 	DateUtils.parseDate(first);
	}

年末

public static Date getYearLast(){
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		Calendar ca = Calendar.getInstance();
		ca.clear(Calendar.MONTH);
		ca.set(Calendar.MONTH, 11);
		ca.set(Calendar.DAY_OF_MONTH,
				ca.getActualMaximum(Calendar.DAY_OF_MONTH));
		//将小时至23
		ca.set(Calendar.HOUR_OF_DAY, 23);
		//将分钟至59
		ca.set(Calendar.MINUTE, 59);
		//将秒至59
		ca.set(Calendar.SECOND, 59);
		//将毫秒至999
		ca.set(Calendar.MILLISECOND, 999);
		String last = format.format(ca.getTime());
		return 	DateUtils.parseDate(last);
	}

月初

	public static Date getMonthFirst(){
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		Calendar c = Calendar.getInstance();
		c.add(Calendar.MONTH, 0);
		c.set(Calendar.DAY_OF_MONTH, 1);
		//设置为1号,当前日期既为本月第一天
		c.set(Calendar.DAY_OF_MONTH, 1);
		//将小时至0
		c.set(Calendar.HOUR_OF_DAY, 0);
		//将分钟至0
		c.set(Calendar.MINUTE, 0);
		//将秒至0
		c.set(Calendar.SECOND, 0);
		//将毫秒至0
		c.set(Calendar.MILLISECOND, 0);
		String first = format.format(c.getTime());
		return 	DateUtils.parseDate(first);

	}

月末

public static Date getMonthlast(){
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

		Calendar ca = Calendar.getInstance();
		ca.set(Calendar.DAY_OF_MONTH,
				ca.getActualMaximum(Calendar.DAY_OF_MONTH));
		//将小时至23
		ca.set(Calendar.HOUR_OF_DAY, 23);
		//将分钟至59
		ca.set(Calendar.MINUTE, 59);
		//将秒至59
		ca.set(Calendar.SECOND, 59);
		//将毫秒至999
		ca.set(Calendar.MILLISECOND, 999);
		String last = format.format(ca.getTime());
	return 	DateUtils.parseDate(last);


	}

季度问题

public class DateRange implements Serializable {
    private Date start;
    private Date end;

    public DateRange(Date start, Date end) {
        this.start = start;
        this.end = end;
    }

    public Date getStart() {
        return start;
    }
    public void setStart(Date start) {
        this.start = start;
    }
    public Date getEnd() {
        return end;
    }
    public void setEnd(Date end) {
        this.end = end;
    }

}

	private static void setMinTime(Calendar calendar){
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
	}

	private static void setMaxTime(Calendar calendar){
		calendar.set(Calendar.HOUR_OF_DAY, calendar.getActualMaximum(Calendar.HOUR_OF_DAY));
		calendar.set(Calendar.MINUTE, calendar.getActualMaximum(Calendar.MINUTE));
		calendar.set(Calendar.SECOND, calendar.getActualMaximum(Calendar.SECOND));
		calendar.set(Calendar.MILLISECOND, calendar.getActualMaximum(Calendar.MILLISECOND));
	}

时间范围

	public static DateRange getThisQuarter() {
		Calendar startCalendar = Calendar.getInstance();
		startCalendar.set(Calendar.MONTH, ((int) startCalendar.get(Calendar.MONTH) / 3) * 3);
		startCalendar.set(Calendar.DAY_OF_MONTH, 1);
		setMinTime(startCalendar);

		Calendar endCalendar = Calendar.getInstance();
		endCalendar.set(Calendar.MONTH, ((int) startCalendar.get(Calendar.MONTH) / 3) * 3 + 2);
		endCalendar.set(Calendar.DAY_OF_MONTH, endCalendar.getActualMaximum(Calendar.DAY_OF_MONTH));
		setMaxTime(endCalendar);

		return new DateRange(startCalendar.getTime(), endCalendar.getTime());
	}