Calendar Printing Program in Java and Python

/**
* The class CalendarProgram inputs a year, month and the weekday name
* of the 1st day of that month and generates its calendar
* @author : www.guideforschool.com
* @Program Type : BlueJ Program - Java
*/

import java.util.*;
class CalendarProgram
{
    //Function to match the given month and return its maximum days
    int findMaxDay(String mname, int y)
    {
        String months[] = {"","January", "February", "March", "April", "May", "June",
            "July", "August", "September", "October", "November", "December"};
        int D[]={0,31,28,31,30,31,30,31,31,30,31,30,31};

        if((y%400==0) || ((y%100!=0)&&(y%4==0)))
        {
            D[2]=29;
        }
        int max = 0;
        for(int i=1; i<=12; i++)
        {
            if(mname.equalsIgnoreCase(months[i]))
            {
                max = D[i];  //Saving maximum day of given month
            }
        }
        return max;
    }

    //Function to match the given weekday name and return its weekday no.
    int findDayNo(String wname)
    {
        String days[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday",
            "Saturday"};
        int f = 0;
        for(int i=0; i<7; i++)
        {
            if(wname.equalsIgnoreCase(days[i]))
            {
                f = i;  //Saving week day no. given day (e.g. '0' for Sunday)
            }
        }
        return f;
    }

    //Function for creating the calendar
    void fillCalendar(int max, int f, String mname, int y)
    {
        int A[][] = new int[6][7];
        int x = 1, z = f;

        for(int i=0;i<6;i++)
        {
            for(int j=f; j<7; j++)
            {
                if(x<=max)
                {
                    A[i][j] = x;
                    x++;
                }
            }
            f = 0;
        }

        for(int j=0; j<z; j++) //Adjustment to bring last (6th) row elements to first row
        {
            A[0][j]=A[5][j];
        }

        printCalendar(A, mname, y); //Calling function to print the calendar
    }

    //Function for printing the calendar
    void printCalendar(int A[][], String mname, int y)
    {
        System.out.println("\n\t----------------------------------------------------");
        System.out.println("\t\t\t   "+mname+" "+y);
        System.out.println("\t----------------------------------------------------");
        System.out.println("\tSUN\tMON\tTUE\tWED\tTHU\tFRI\tSAT");
        System.out.println("\t----------------------------------------------------");

        for(int i = 0; i < 5; i++)
        {
            for(int j = 0; j < 7; j++)
            {
                if(A[i][j]!=0)
                System.out.print("\t "+A[i][j]);
                else
                System.out.print("\t ");
            }
            System.out.println("\n\t----------------------------------------------------");
        }
    }

    public static void main(String args[])
    {
        CalendarProgram ob = new CalendarProgram();
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter the year : ");
        int y = sc.nextInt();
        System.out.print("Enter the month name (e.g. January) : ");
        String mname = sc.next();
        System.out.print("Enter the week day name (e.g. Sunday) of 1st day of "+mname+" : ");
        String wname = sc.next();

        int max = ob.findMaxDay(mname,y);
        int f = ob.findDayNo(wname);
        ob.fillCalendar(max,f,mname,y);
    }
}

def find_max_day(month, year):
    months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]
    days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

    # Leap year correction is needed only for February.
    if year % 400 == 0 or (year % 100 != 0 and year % 4 == 0):
        days[1] = 29

    for i in range(12):
        if month.lower() == months[i].lower():
            return days[i]
    return 0


def find_day_no(weekday):
    days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]

    # The index of the weekday becomes the calendar column number.
    for i in range(7):
        if weekday.lower() == days[i].lower():
            return i
    return -1


year = int(input("Enter the year: "))
month = input("Enter the month name: ")
weekday = input("Enter the weekday name of 1st day of " + month + ": ")

max_day = find_max_day(month, year)
first_day = find_day_no(weekday)

if max_day == 0 or first_day == -1:
    print("Invalid month or weekday name")
else:
    # Calendar matrix stores dates; 0 means the cell is blank.
    cal = [[0 for j in range(7)] for i in range(6)]
    day = 1
    row = 0
    col = first_day

    while day <= max_day:
        cal[row][col] = day
        day = day + 1
        col = col + 1

        # After Saturday, continue from Sunday in the next row.
        if col == 7:
            col = 0
            row = row + 1

    print("----------------------------------------------------")
    print("                 ", month, year)
    print("----------------------------------------------------")
    print("SUN\tMON\tTUE\tWED\tTHU\tFRI\tSAT")
    print("----------------------------------------------------")

    for i in range(6):
        for j in range(7):
            if cal[i][j] == 0:
                print("\t", end="")
            else:
                print(cal[i][j], "\t", end="")
        print()