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package Q6;
import java.util.*;
public class WeekDay {
private int numberOfDays;
public static final int JANUARY = 0;
public static final int FEBRUARY = 0;
public static final int MARCH = 0;
public static final int APRIL = 0;
public static final int MAY = 0;
public static final int JUNE = 0;
public static final int JULY = 0;
public static final int AUGUST = 0;
public static final int SEPTEMBER = 0;
public static final int OCTOBER = 0;
public static final int NOVEMBER = 0;
public static final int DECEMBER = 0;
public static final int SUNDAY = 0;
public static final int MONDAY = 0;
public static final int TUESDAY = 0;
public static final int WEDNESDAY = 0;
public static final int THURSDAY = 0;
public static final int FRIDAY = 0;
public static final int SATURDAY = 0;
public String getWeekDay(int day, int month, int year) {
int totalDaysSinceEpoch = daysSinceEpoch(day, month, year);
this.puts("days since epoch: %d", totalDaysSinceEpoch);
this.puts("weekday: %d", totalDaysSinceEpoch % 7);
switch (totalDaysSinceEpoch % 7) {
case 0:
return "Sunday";
case 1:
return "Monday";
case 2:
return "Tuesday";
case 3:
return "Wednesday";
case 4:
return "Thursday";
case 5:
return "Friday";
case 6:
return "Saturday";
default:
return "Unknown";
}
}
private int daysSinceEpoch(int day, int month, int year) {
int days = (year - 1900) * 365;
this.puts("days: %d", days);
days += (year - 1900) / 4;
this.puts("days: %d", days);
if (isLeapYear(year) && (month == 1 || month == 2)) days -= 1;
this.puts("days: %d", days);
days += daysThisYearUpTo(day, month);
this.puts("days: %d", days);
return days;
}
private boolean isLeapYear(int year) {
return year % 4 == 0;
}
private int daysThisYearUpTo(int day, int month) {
int x = 0;
for (int i = 1; i < month; i++) {
this.puts("days in month: %d is %d", month, daysInMonth(month));
x += daysInMonth(i);
}
return x + day;
}
private int daysInMonth(int month) {
switch (month) {
case 1:
return 31;
case 2:
return 28;
case 3:
return 31;
case 4:
return 30;
case 5:
return 31;
case 6:
return 30;
case 7:
return 31;
case 8:
return 31;
case 9:
return 30;
case 10:
return 31;
case 11:
return 30;
case 12:
return 31;
default:
return 0;
}
}
private void puts(String format, Object... args) {
System.out.println(String.format(format, args));
}
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.println("Enter year:");
int year = in.nextInt();
System.out.println("Enter month:");
int month = in.nextInt();
System.out.println("Enter day:");
int day = in.nextInt();
System.out.println(new WeekDay().getWeekDay(day, month, year));
}
}
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