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

Question

If I have int year, int month, int day in Java, how to find name of day ? Is there already some functions for this ?

Answer 1

Use SimpleDateFormat with a pattern of EEEE to get the name of the day of week.

// Assuming that you already have this. int year = 2011; int month = 7; int day = 22;  // First convert to Date. This is one of the many ways. String dateString = String.format("%d-%d-%d", year, month, day); Date date = new SimpleDateFormat("yyyy-M-d").parse(dateString);  // Then get the day of week from the Date based on specific locale. String dayOfWeek = new SimpleDateFormat("EEEE", Locale.ENGLISH).format(date);  System.out.println(dayOfWeek); // Friday 

Here it is wrapped all up into a nice Java class for you.

import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.*;   public class DateUtility {      public static void main(String args[]){         System.out.println(dayName("2015-03-05 00:00:00", "YYYY-MM-DD HH:MM:ss"));     }      public static String dayName(String inputDate, String format){         Date date = null;         try {             date = new SimpleDateFormat(format).parse(inputDate);         } catch (ParseException e) {             e.printStackTrace();         }         return new SimpleDateFormat("EEEE", Locale.ENGLISH).format(date);     } } 

Answer 2

You can do something like this to get the names of the days of the week for different locales.

Here's the important part:

DateFormatSymbols dfs = new DateFormatSymbols(usersLocale); String weekdays[] = dfs.getWeekdays(); 

That can be combined with this:

Calendar cal = Calendar.getInstance(); int day = cal.get(Calendar.DAY_OF_WEEK); 

To get what you're looking for:

String nameOfDay = weekdays[day];