###日期转换
static Date parseFromStr(String dateStr) { if (dateStr != null) { java.util.Date date_s = null; try { //dateStr = “2009-02” date_s = DateUtils.parseDate(dateStr, new String[]{“yyyyMM”, “yyyy”, “yyyy-MM”}); logger.info(“s =====» {} -> {}”, dateStr, date_s.toString()); java.util.Date date_s1 = DateUtils.parseDate(dateStr, new String[]{“yyyy-MM”}); logger.info(“s1 ====» {} -> {}”, dateStr, date_s1.toString()); java.util.Date date_s2 = DateUtils.parseDate(dateStr, new String[]{“yyyyMM”}); logger.info(“s2 ====» {} -> {}”, dateStr, date_s2.toString()); } catch (ParseException e) { e.printStackTrace(); } Date result = new Date(date_s.getTime()); logger.info(“{} ==> {}”, dateStr, result.toString()); return result; } else { return null; } }
###输入:2009-02
###输出结果
s =====» 2009-02 -> Wed Oct 01 00:00:00 CST 2008 s1 ====» 2009-02 -> Sun Feb 01 00:00:00 CST 2009 s2 ====» 2009-02 -> Wed Oct 01 00:00:00 CST 2008 2009-02 ==> 2008-10-01
问题处在于 2009-02 在经过 yyyyMM 这个格式的时候，会被解析成 2008-10。
###解决办法
把这一行代码 date_s = DateUtils.parseDate(dateStr, new String[]{“yyyyMM”, “yyyy”, “yyyy-MM”}); 调整成为： date_s = DateUtils.parseDate(dateStr, new String[]{“yyyy-MM”, “yyyy”, “yyyyMM”});
###正确的输出
s =====» 2009-02 -> Sun Feb 01 00:00:00 CST 2009 s1 ====» 2009-02 -> Sun Feb 01 00:00:00 CST 2009 s2 ====» 2009-02 -> Wed Oct 01 00:00:00 CST 2008 2009-02 ==> 2009-02-01
apache的包居然有这种坑，也是醉了。