考虑 AM/PM 计算 Java 中的日期/时间差

我想使用 Date 和 Calendar 类计算 java 中两个日期/时间之间的差异.我的格式是2012-01-24 12:30:00 PM".

I want to calculate the difference between two date/time in java using Date and Calendar classes. The format that I have is "2012-01-24 12:30:00 PM".

我已经实现了我自己的方法,并在谷歌上搜索它以与其他人一起工作,但没有得到正确的提示来处理 AM 和 PM 值.

I have implemented my own method and also google it to work with others, but haven't getting the right hint to handle AM and PM values.

只要时间中有 12(AM/PM),日期/时间差异就会受到影响.例如,如果我的日期/时间为2012-01-24 12:30:00 PM"和2012-01-24 02:30:00 PM",则显示时差为 10 小时.

The date/time difference got troubled whenever the time have 12(AM/PM) in it. For example if I have date/time "2012-01-24 12:30:00 PM" and "2012-01-24 02:30:00 PM" it shows the difference is 10 hours.

考虑 此链接上的代码 如何修改它来处理 AM 和 PM.

Considering the code on this link how can it be modified to handle AM and PM.

要将字符串日期转换为日期,我使用以下代码:

To convert String date into Date I use following code:

    String sessionTimeStart = "2012-01-24 12:30:00 PM";
    String sessionTimerEndOrCurrent = "2012-01-24 02:30:00 PM";
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss a"); 

    Date d1 = null;
    Date d0 = null; 
    try {
        d1 = format.parse(sessionTimeStart);
        d0 = format.parse(sessionTimerEndOrCurrent);
    } catch (ParseException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }

推荐答案

问题是你的日期格式:而不是 yyyy-MM-dd HH:mm:ss a 使用 yyyy-MM-dd hh:mm:ss a.

The problem is your date format: instead of yyyy-MM-dd HH:mm:ss a use yyyy-MM-dd hh:mm:ss a.

HH 将是一天中的小时 (0-23),而 hh 将是 AM/PM (1-12) 中的小时.因此,您的日期格式 02:30:00 将被解析为那样,而不是被转换为 PM 版本(一天中的小时为 14:30:00).

HH will be the hour in day (0-23) whereas hh will be the hour in AM/PM (1-12). Thus with your date format 02:30:00 will be parsed as just that instead of being converted to the PM version (which in hour of day would be 14:30:00).

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