How to Calculate Week Number From Current Date in Java?

The WeekFields class's weekOfMonth() method is utilized to return the field for access the week of a month based on this WeekFields.

• If the first day of the month is a Monday, week one begins on the first and there is no week zero.
• If the the first day of the month is a Monday, week one begins on the first and there is no week zero.
• If the 4th of the month is a Monday, week one begins on the 4th, and weeks zero begin on the 1st.
• If the 5th of the month is a Monday, week two begins on the 5th, while week one begins on the 1st.

This field is suitable with any calendar system.

Syntax:

public TemporalField weekOfMonth()

Parameters: This technique will not take anything.

Return value: These method doesn't really return null, instead it returns a field with access to the week-based-year.

The WeekFields.weekOfMonth() method is demonstrated in the following applications:

Filenumber: WeekNumber1.java

// Java application to demonstrate
// WeekFields.weekOfMonth() method
import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.TemporalField;
import java.time.temporal.WeekFields;
public class WeekNumber1{
	public static void main(String[] args)
	{
		// build WeekFields
		WeekFields weekFields= WeekFields.of(DayOfWeek.MONDAY, 1);
		// apply weekOfMonth()
		TemporalField weekOfMonth= weekFields.weekOfMonth();
		// LocalDate class is being created
		LocalDate day= LocalDate.of(2022, 12, 23);
		// get week of month for localdate
		int A = day.get(weekOfMonth);
		// Result is being printed
		System.out.println("Month for the Week "+ day + " :" + A);
	}
}

Output:

Month for the Week 2022-12-23 :4

Filename: WeekNumber2.java

// Java application to demonstrate
// WeekFields.weekOfMonth() method
import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.TemporalField;
import java.time.temporal.WeekFields;
public class WeekNumber2 {
	public static void main(String[] args)
	{
		// Build WeekFields
		WeekFields weekFields= WeekFields.of(DayOfWeek.SUNDAY, 1);
		// apply weekOfMonth()
		TemporalField weekOfMonth= weekFields.weekOfMonth();
		// LocalDate is being created
		LocalDate day = LocalDate.of(2022, 12, 24);
		// obtain the week of the month for localDate
		int wom = day.get(weekOfMonth);
		// Result is beign printed
		System.out.println("Month of the Week"+ day + " :" + wom);
	}
}

Output:

Month of the Week 2022-12-24 :4

Week Number of the Year

Filename:  WeekNumber3.java

import java.util.*;
public class WeekNumber3{
   public static void main(String[] args) throws Exception {
      Date d1 = new Date();
      Calendar c1 = Calendar. getInstance();
      c1.setTime(d1);
      System.out.println("Today is the " + c1.WEEK_OF_YEAR+ " Week of the year ");
      System.out.println("Today is the "+c1.DAY_OF_MONTH + " Month of the year");
      System.out.println("Today is the "+c1.WEEK_OF_MONTH +"  Month  of the year");
   }
}

Output:

Today is the 3 Week of the year
Today is the 5 Month of the year
Today is the 4 Month of the year

Filename: WeekNumber4.java

import java.util.Calendar;
public class WeekNumber4 {
   public static void main(String[] args) {
      Calendar cal = Calendar.getInstance();
      System.out.println("Present week in the month is: " +cal.get(Calendar.WEEK_OF_MONTH));
      System.out.println("Present Week of the year is : " +cal.get(Calendar.WEEK_OF_YEAR));
      cal.add(Calendar.WEEK_OF_MONTH, 1);
      System.out.println("After one year : " + (cal.get(Calendar.MONTH) + 1)+ "-"+ cal.get(Calendar.DATE)+ "-"+ cal.get(Calendar.YEAR)); 
   }
}

Output:

Present week in the month is: 5
Present Week of the year is : 53
After one year : 1-1-2023