Date日期的相关处理集合

获取一些需要的日期集合总结

/**
	 * 得到某年某月的第一天
	 * 

	 * @param year
	 * @param month
	 * @return
	 */
	public static String getFirstDayOfMonth(int year, int month) {

		Calendar cal = Calendar.getInstance();

		cal.set(Calendar.YEAR, year);

		cal.set(Calendar.MONTH, month - 1);

		cal.set(Calendar.DAY_OF_MONTH, cal.getMinimum(Calendar.DATE));
		
		cal.set(Calendar.HOUR_OF_DAY, 0);    
		cal.set(Calendar.MINUTE, 0);    
		cal.set(Calendar.SECOND, 0);
		
		return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(cal.getTime());

	}

/**
	 * 得到某年某月的最后一天
	 * 
	 * @param year
	 * @param month
	 * @return
	 */
	public String getLastDayOfMonth(int year, int month) {

		Calendar cal = Calendar.getInstance();

		cal.set(Calendar.YEAR, year);

		cal.set(Calendar.MONTH, month - 1);

		int value = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
		
		cal.set(Calendar.DAY_OF_MONTH, value);
		
		cal.set(Calendar.HOUR_OF_DAY, 23);    
		cal.set(Calendar.MINUTE, 59);    
		cal.set(Calendar.SECOND, 59);
	
		return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(cal.getTime());

	}

	/**
	 * 测试 
	 * @param args
	 */

public static void main(String[] args) {

		FirstEndOfMonth tFirstEndOfMonth = new FirstEndOfMonth();
		
		System.out.println(tFirstEndOfMonth.getFirstDayOfMonth(2014, 2));
		System.out.println(tFirstEndOfMonth.getLastDayOfMonth(2012, 2));

	}

参考资料：
java 日期格式时间24小时制 ：http://blog.csdn.net/flfna/article/details/6457327
java获取年份的第一天和最后一天 ：
http://blog.csdn.net/tengdazhang770960436/article/details/8889534
得到某年某月的第一天和最后一天
http://www.oschina.net/code/snippet_132569_8436