Find name of day by year, month and day [duplicate]

Answer 1

The name of the week day differs per locale. So you have to use a DateFormat with the proper locale. For example:

SimpleDateFormat format = new SimpleDateFormat("EEEE");
System.out.println(format.format(date));

The Date object can be obtained in multiple ways, including the deprecated Date(..) constructor, the Calendar.set(..) methods or joda-time DateTime. (for the latter you can use joda-time's own DateTimeFormat)