Question

我想知道使用AM / PM多少小时，但我只能在不使用AM / PM的情况下获得小时数

这是我的代码

 private TextView textView,textView1,txtdiff;

String dateStart = "03/13/17 08:30:00";
String dateStop = "03/13/17 05:30:00";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    textView = (TextView) findViewById(R.id.current_date_view);
    textView1 = (TextView) findViewById(R.id.secondDate);
    txtdiff = (TextView) findViewById(R.id.difference);

    textView.setText("First Date: "+ dateStart);
    textView1.setText("Second Date: "+ dateStop);
}

public void getCurrentDate(View view) {

    SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");

    Date d1 = null;
    Date d2 = null;

    try {
        d1 = format.parse(dateStart);
        d2 = format.parse(dateStop);

        long diff = d2.getTime() - d1.getTime();

        long diffSeconds = diff / 1000 % 60;
        long diffMinutes = diff / (60 * 1000) % 60;
        long diffHours = diff / (60 * 60 * 1000) % 24;
        long diffDays = diff / (24 * 60 * 60 * 1000);

        String seconds = Long.toString(diffSeconds);
        String minutes = Long.toString(diffMinutes);
        String hours = Long.toString(diffHours);
        String days = Long.toString(diffDays);

        txtdiff.setText(hours + " Hours");



    } catch (Exception e) {
        e.printStackTrace();
    }

}

问题是我想添加AM PM。

我尝试使用AM和PM添加字符串

String dateStart = "03/13/17 08:30:00 am";
String dateStop = "03/13/17 05:30:00 pm";

并使用SimpleDate格式：

SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss a");

但不幸的是它不起作用，任何人都可以指出我正确的方向

Answer 1

你应该使用小＆＃39; hh＆＃39;当您定义小时格式时

SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a");

否则，您的值ara被视为使用24h格式定义，08和05将在早上，即使您已指定上午/下午

使用SimpleDateFormat的日期差异

1 个答案: