We can change date format of a date as below:

Here, I have defined different date formats:

String FACEBOOK_DATE_FROMAT = "yyyy-MM-dd'T'HH:mm:ssZZZZZ";
String MESSAGE_DATE_FORMAT = "MM/dd/yyyy hh:mm a";
String MESSAGE_DATE_TIME_FORMAT = "MM/dd/yyyy HH:mm:ss";
String TIME_FORMAT = "hh:mm a";
String DAY_TIME_FORMAT = "E hh:mm a";
String MONTH_DAY_FORMAT = "MMMMMMMMM dd";
String MONTH_YEAR_FORMAT = "MMMMMMMMM dd yyyy";

Convert long date into proper date fromat :

long longDate = 1384099496;  
String dateString = new SimpleDateFormat(MESSAGE_DATE_TIME_FORMAT,Locale.getDefault()).format(new Date(longDate));

Output:
date will be in the format of MM/dd/yyyy HH:mm:ss.

Convert Facebook datetime format:

Suppose we have facebook date as: 2013-11-30T07:41:39+0000 and we want to convert this into 11/30/2013 7:41, then we will do it as below:

SimpleDateFormat simple=new SimpleDateFormat(FACEBOOK_DATE_FROMAT, Locale.getDefault());
    Date dateStr = null;
try {
    dateStr = simple.parse(modifiedDate);
} catch (ParseException e) {
    e.printStackTrace();
}
String date = new SimpleDateFormat(Constant.MESSAGE_DATE_FORMAT,Locale.getDefault()).format(dateStr);

Output:
Output will be 11/30/2013 7:41 AM

Convert date format to fullMonth date year:

String date = new SimpleDateFormat(MONTH_YEAR_FORMAT, Locale.getDefault()).format(dateStr);

Output:
Output will be November 30 2013

Convert date format to fullMonth date:

String date = new SimpleDateFormat(MONTH_DAY_FORMAT, Locale.getDefault()).format(dateStr);

Output:
Output will be November 30

Convert date format to weekday date hour:minutes AM_PM:

String date = new SimpleDateFormat(DAY_TIME_FORMAT, Locale.getDefault()).format(dateStr);

Output:
Output will be Saturday 30 7:41 AM