Calendar.HOUR_OF_DAY与Calendar.HOUR不同

最新推荐文章于 2025-02-13 19:36:49 发布

转载最新推荐文章于 2025-02-13 19:36:49 发布 · 2k 阅读

本文通过一个具体的Java代码示例，详细解析了Calendar类中HOUR_OF_DAY与HOUR的区别，前者用于24小时制，后者用于12小时制。

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今天在做一个时间的时候，发现老是少12个小时。检查了好一会儿，才发现是Calendar.HOUR_OF_DAY与Calendar.HOUR导致的不同。

Java代码  

String newStr = "1332391500000";  

Calendar cal = Calendar.getInstance();  

cal.setTimeInMillis(Long.parseLong(newStr));  

System.out.println(cal.getTime());  

System.out.println(cal.get(Calendar.YEAR) + "-"  

        + format(cal.get(Calendar.MONTH) + 1, 2) + "-"  

        + format(cal.get(Calendar.DATE), 2) + " "  

        + format(cal.get(Calendar.HOUR_OF_DAY), 2) + ":"  

        + format(cal.get(Calendar.MINUTE), 2) + ":"  

        + format(cal.get(Calendar.SECOND), 2));

文档已经解释的很清楚了。

Calendar.HOUR_OF_DAY是：

Field number for get and set indicating the hour of the day. HOUR_OF_DAY is used for the 24-hour clock. E.g., at 10:04:15.250 PM the HOUR_OF_DAY is 22.

Calendar.HOUR是：

Field number for get and set indicating the hour of the morning or afternoon. HOUR is used for the 12-hour clock (0 - 11). Noon and midnight are represented by 0, not by 12. E.g., at 10:04:15.250 PM the HOUR is 10.