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How to remove year in DateFormat follower locale?

I use DateFormat to show Day and Month. DateFormat supports MEDIUM, LONG, FULL all have a year. I want to remove year from this code and how can I achieve this
SimpleDateFormat sdf = (SimpleDateFormat) DateFormat.getDateInstance(DateFormat.LONG, locale);
sdf.applyPattern(sdf.toPattern().replaceAll("[^\\p{Alpha}]*y+[^\\p{Alpha}]*", ""));
But I get an error with some locale like:
bo_CN : སྤྱི་ལོ་y MMMMའི་ཙེས་dད
vi: 'Ngày' dd 'tháng' MM 'năm' y
se_SE: d 'de' MMMM 'de' y

You can use SimpleDateFormat:
Date date = new Date();
java.text.SimpleDateFormat df = new java.text.SimpleDateFormat("MM/dd");
String dateString = df.format(date);
Output:
01/21

Try with the below code
String shortDate = "dd.MM";
String mediumDate = "MMM dd";
String longDate = "MMMM dd";
String fullDate = "EEEE, MMMM dd";
Locale locale = new Locale("EN");
DateFormat df = new SimpleDateFormat(fullDate, locale); \\Use the required format here
String formattedDate = df.format(new Date());
I have removed the year part and created custom equivalent of
DateFormat.SHORT as shortDate
DateFormat.MEDIUM as mediumDate
DateFormat.LONG as longDate
DateFormat.FULL as fullDate

How to get proper written date using SimpleDateFormat in Java

I have this:
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
Date result = dateFormat.parse(this.getCreatedTime());
Basically I want to convert a string like "2016-09-27T09:19:57Z" into something like "September 27, 2016 at 9:19 AM".
If I use the code above I end up with a Date object, but all the methods are deprecated. So how do I achieve this?

You can use DateFormat again as #Thomas wrote:
DateFormat inputFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
Date inputDate = inputFormat.parse(this.getCreatedTime());
DateFormat outputFormat = new SimpleDateFormat("outputFormat");
String output = outputFormat.format(inputDate);

You should do research before posting any question here.
Use this to get Date from your required pattern
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.getDefault());
Date date = null;
try {
date = format.parse(unformattedDate);
} catch (ParseException e) {
e.printStackTrace();
}
Make new instance of your desired patter.
format = new SimpleDateFormat("MMMM dd, yyyy 'at' HH:mm a", Locale.getDefault());
String formattedDate = format.format(date);

Java Formatting Date String

I need to convert this 20140815
into 15.08.2014 and into 15.08.2014 00:00:00
How do I do that, what opportunities are there in Java

You could use SimpleDateFormat as follows
SimpleDateFormat inputFormat = new SimpleDateFormat("yyyyMMdd");
SimpleDateFormat outputFormat = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");
Date date = inputFormat.parse("20140815");
String result = outputFormat.format(date);

Why bother with Dates... just use Strings:
String output = input.replaceAll("(....)(..)(..)", "$3.$2.$1");
or
String output = input.replaceAll("(....)(..)(..)", "$3.$2.$1 00:00:00");

How to convert date and time stored in string to 24 format time in android?

I have my date and time stored in string i.e my string contains str ="18/01/2013 5:00:00 pm". How can I convert it to 24 format time in android?

You can use two SimpleDateFormat instances: one to parse the input as a date and a second to format the date as a string with the desired format.
For example, formattedDate in the code below will be 18/01/2013 17:00:00:
String str = "18/01/2013 5:00:00 pm";
SimpleDateFormat input = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss a");
Date dt = input.parse(str);
SimpleDateFormat output = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
String formattedDate = output.format(dt); //contains 18/01/2013 17:00:00
Notes:
hh is for Hour in am/pm (1-12) whereas HH is for Hour in day (0-23).
for more formatting options, check the javadoc

try
String str ="18/01/2013 5:00:00 pm";
Date date = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss a").parse(str);
str = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss").format(date);
System.out.println(str);
output
18/01/2013 17:00:00

To get AM PM and 12 hour date format use hh:mm:ss a as string formatter WHERE hh is for 12 hour format and a is for AM PM format.
Note: HH is for 24 hour and hh is for 12 hour date format
SimpleDateFormat formatter = new SimpleDateFormat("mm/dd/yyyy hh:mm:ss a");
String newFormat = formatter.format(testDate);
Example
String date = "18/01/2013 5:00:00 pm";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy/mm/dd HH:MM:SS");
Date testDate = null;
try {
testDate = sdf.parse(date);
}catch(Exception ex){
ex.printStackTrace();
}
SimpleDateFormat formatter = new SimpleDateFormat("mm/dd/yyyy hh:mm:ss a");
String newFormat = formatter.format(testDate);
System.out.println(".....Date..."+newFormat);

You can use SimpleDateFormat for that:
SimpleDateFormat dateFormat = new SimpleDateFormat(dd/mm/yyyy HH:mm:ss");
Refer to this which was opposite to your requirement. Just posted the link so you might get the idea of difference that HH and hh makes.

Try using the java SimpleDateFormat class.
Example:
SimpleDateFormat df = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
df.parse(date);
The upper case HH use a 24h format

Help needed in formatting date in Java

Hi I have the following date as String format.
Input
2010-04-20 05:34:58.0
Output I want the string like
20, Apr 2010
Can someone tell me how to do it ?

Try this:
DateFormat inputFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");
DateFormat outputFormat = new SimpleDateFormat("dd, MMM yyyy");
Date yourDate = inputFormat.parse("2010-04-20 05:34:58.0");
String formattedDate = outputFormat.format(yourDate);

You might want to try this:
SimpleDateFormat inFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");
Date date = inFormat.parse( "2010-04-20 05:34:58.0");
SimpleDateFormat outFormat = new SimpleDateFormat("dd, MMM yyyy");
System.out.println(outFormat.format( date));