Converting datetime to string, wrong hours

Question

I am doing like this in my android app (java):

String sdt_ = DateFormat.format("yyyyMMdd  HH:mm", dt_).toString();

but I got this

01-16 14:31:13.308: D/ThS(25810): dt_ = Wed Jan 16 13:28:00 GMT+00:00 2013
01-16 14:31:23.758: D/ThS(25810): sdt_ = 20130116  HH:28

if I change HH to hh I will get this

sdt_ = 20130116  01:28

but I need this

sdt_ = 20130116  13:28

Solution 1

i don't know, what is wrong with your code, but this code works for me:

DateFormat df = new SimpleDateFormat("yyyyMMdd  HH:mm");
String sdt = df.format(new Date(System.currentTimeMillis()));
System.out.println(sdt);

EDIT:

later I found out that your original code should work with this:

String sdt_ = DateFormat.format("yyyyMMdd  kk:mm", dt_).toString();

apparently, android.text.format.DateFormat doesn't use 'H' constraint and uses 'k' instead of it! see this question for more details: How to set 24-hours format for date on java?

Solution 2

This will do it for you:

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd  HH:mm", Locale.getDefault());
String sdt_ = sdf.format(dt_);

Solution 3

You used hh in your SimpleDateFormat pattern. Thats the 12 hour format. Use kk instead, that gives you the hours of the day in a 24 hour format.See SimpleDateFormat

Comments

[Foenix]

I do not see any 'kk' by your link . I used HH in my pattern.

[Foenix]

thank you, it is working (with or without Locale.getDefault())

[Berťák]

see my other answer, if you still want to use android.text.format.DateFormat :-)

[K_Anas]

@Foenix see in the table k hour in day (1-24) (Number) 24

[jenzz]

It does work without Locale.getDefault(), but if you are using Eclipse it will show you a lint warning and ask you to provide a locale to allow local date formatting. So explicitly setting the default locale is the same as omitting it.

[Foenix]

yes I saw this hint, now I know how to use default locale, thank you