/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.time.* ;
import java.time.temporal.* ;
 
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
DayOfWeek firstDayOfWeek = DayOfWeek.MONDAY ;
 
ZoneId z = ZoneId.of( "America/Montreal" ) ;
YearMonth ym = YearMonth.now( z ) ;
 
LocalDate monthStart = ym.atDay( 1 ) ;
LocalDate monthStop = ym.atEndOfMonth() ;
 
LocalDate calendarStart = monthStart.with( TemporalAdjusters.previousOrSame( firstDayOfWeek ) ) ;
LocalDate calendarStop = monthStop.with( TemporalAdjusters.next( firstDayOfWeek ) ) ;
 
long weeks = ChronoUnit.WEEKS.between( calendarStart , calendarStop ) ;
 
System.out.println( "firstDayOfWeek: " + firstDayOfWeek ) ;
System.out.println( "ym: " + ym );
System.out.println( "month: " + monthStart + "/" + monthStop );
System.out.println( "calendar: " + calendarStart + "/" + calendarStop );
System.out.println( "weeks: " + weeks ) ;
 
	}
}

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