Display Date in 24-hour issue

Question

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.

Answer 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.