/** * 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