Display Date in 24-hour issue

问题:

I am working simple app where I can get current DateTime and convert that into 24-hour format.

Code:

  String DATE_yyyy_MM_dd_hh_mm_ss = "yyyy-MM-dd hh:mm:ss";

  String DATE_yyyy_MM_dd_HH_mm_ss  = "yyyy-MM-dd HH:mm:ss";  


  TextView tv=(TextView)findViewById(R.id.textView);

  tv.append("\n in 12-hour format: "+getDateFormatted(bootDate));

  tv.append("\n in 24-hour format: "+getDateFormatted2(bootDate));

  public String getDateFormatted(Date date){
    return String.valueOf(DateFormat.format(DATE_yyyy_MM_dd_hh_mm_ss, date));
}

public String getDateFormatted2(Date date){
    return String.valueOf(DateFormat.format(DATE_yyyy_MM_dd_HH_mm_ss, date));
}

Problem:

It's perfectly working in my devices Samsung Galaxy S3(Android 4.3), S4(Android 4.3) and Nexus 5(Android 4.4). while the same code I am running in Huawei Ascend Y330 device(Android 4.2.2) it's not display properly.

Screenshot in Samsung Galaxy S3, S4 and Nexus 5:

Screenshot in Huawei Ascend Y330:

So, what is the problem actually? I don't understand. Is it android system issue? or device issue?

Any idea anyone.

回答1:

So this post suggested to use SimpleDateFormat instead of DateFormat. For more explanation about the differences between these two classes, you could take a look at this post.

回答2:

According to the documentation SimpleDateFormat can handle the 'H' for 24h format but DateFormat needs 'k'.

Use a literal 'H' (for compatibility with SimpleDateFormat and Unicode) or 'k' (for compatibility with Android releases up to and including Jelly Bean MR-1) instead. Note that the two are incompatible.

回答3:

Try this,

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(new Date());
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());

TextView tv=(TextView)findViewById(R.id.textView);
tv.append("\n in 12-hour format: " +sdf);
tv.append("\n in 24 -hour format: " +sdf2);

回答4:

This works in all the devices,

static final SimpleDateFormat IN_DATE_FORMAT = new SimpleDateFormat("HH:mm:ss", Locale.US);
static final SimpleDateFormat OUT_DATE_FORMAT = new SimpleDateFormat("hh:mma", Locale.US);

/**
 * To format the time.
 *
 * @param strDate The input date in HH:mm:ss format.
 * @return The output date in hh:mma format.
 */
private String formatTime(String strDate) {
    try {
        Date date = IN_DATE_FORMAT.parse(strDate);
        return OUT_DATE_FORMAT.format(date);

    } catch (Exception e) {
        return "N/A";
    }
}

use the method : formatTime(YOUR_TIME)