Find Out The Date For First Sunday/monday Etc Of The Month

I want to detect date of First Sunday/Monday of first/second week in every month in java? How can I achieve it? I have checked Calendar class as well as Date class in java but not

Solution 1:

            Calendar calendar = Calendar.getInstance();               
            SimpleDateFormat sdf = new SimpleDateFormat("MMM/dd/YYYY");
            calendar.set(Calendar.MONTH,Calendar.JUNE);
            calendar.set(Calendar.DAY_OF_MONTH,1);          
            int day = (Calendar.TUESDAY-calendar.get(Calendar.DAY_OF_WEEK));            
            if(day<0){
              calendar.add(Calendar.DATE,7+(day));
            }else{
                calendar.add(Calendar.DATE,day);
            }
            System.out.println("First date is "+sdf.format(calendar.getTime()));`enter code here`

Solution 2:

This will Give you First Saturday Of every month Of a Year of system date... u can also get other replace saturday with any other day

Invented By HK2 and Hemant

import java.util.Calendar;
import java.util.GregorianCalendar
           classDemo{
                 SimpleDateFormatformat=newSimpleDateFormat("dd-MMM-yyyy");
                StringDATE_FORMAT="yyyy MM dd";

                SimpleDateFormatsdf=newSimpleDateFormat(DATE_FORMAT);
                Calendarc1= Calendar.getInstance(); 

                String y=sdf.format(c1.getTime());
                String years=y.substring(0,4);
                int year=Integer.parseInt(years);

                Calendarcal=newGregorianCalendar(year, Calendar.JANUARY, 1);
                for (inti=0, inc = 1; i <366 && cal.get(Calendar.YEAR) == year; i+=inc) {
                    if (cal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY) {

                        String frm="";
                        frm=format.format(cal.getTime());



                         // System.out.println("the value of the saturday is "+format.format(cal.getTime()));
                          cal.add(Calendar.MONTH,1);
                          cal.set(Calendar.DAY_OF_MONTH, 1);
                    } 

                    else {
                        cal.add(Calendar.DAY_OF_MONTH, 1);
                         }
                }
}

Solution 3:

Java.time

Using java.time library built into Java 8:

import java.time.{DayOfWeek, LocalDate}
import java.time.temporal.TemporalAdjusters.firstInMonth

val now = LocalDate.now() # 2015-11-23
val firstMonday = now.`with`(firstInMonth(DayOfWeek.MONDAY)) # 2015-11-02 (Monday)

You may choose any day from java.time.DayOfWeek.{MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY}.

If you need to add time information, you may use any available LocalDate to LocalDateTime conversion like

firstMonday.atStartOfDay() # 2015-11-02T00:00

Solution 4:

The simplest method of doing it with Java 8 is:

LocalDate firstSundayOfNextMonth = LocalDate
              .now()
              .with(firstDayOfNextMonth())
              .with(nextOrSame(DayOfWeek.MONDAY));

Solution 5:

You can get the day of the week for a specific date in Java using Calendar class as discussed here:

How to determine day of week by passing specific date?

You can then loop over the dates in your range to find the first instance of Sunday and the second instance of Monday.