我正在编写一个程序来显示给定日期的日期。 (例如,周四为1970年1月1日。) 虽然我试图解决一些问题。将01/01/0001的日期作为星期一是否正确?
这是我的程序。
/*Concept:
The noOfDays variable will count the no of days since 01/01/0001. And this will be Day one(1). E.g
noOfDays = 365 for 01/12/0001 and noOfDays = 731 for 01/01/0003 and so on....
Since I taken Monday as 01/01/0001,the day of the specific date can be achieved by switching(noOfDays%7)
E.g. 365 % 7 = 1. So, the 365th day is monday...
*/
import java.util.Scanner;
class DayDisplayer
{
long noOfDays;
int month;
int days;
int year;
Scanner scan;
int countYear;
int countMonth;
DayDisplayer()
{
scan = new Scanner(System.in);
noOfDays = 0;
System.out.println("Enter the date please");
days = scan.nextInt();
month = scan.nextInt();
year = scan.nextInt();
System.out.println("Your Date is: "+days+"/"+month+"/"+year);
}
boolean leapYearCheck(int year)
{
if(((year%100 == 0) && (year%400 != 0)) || (year%4 != 0)) // when it is divisible by 100 and not by 400.
return false;
else
return true;
}
boolean isThere31Days()
{
if (((countMonth >> 3)^(countMonth & 1)) == 1)
return true;
else
return false;
}
void getDaysThatInDays()
{
noOfDays += days;
}
void getDaysThatInMonth()
{
countMonth = 1;
while(countMonth<month)
{
if(countMonth == 2)
if(leapYearCheck(year) == true)
noOfDays += 29;
else
noOfDays += 28;
else
if (isThere31Days())
noOfDays += 31;
else
noOfDays += 30;
countMonth++;
}
}
void getDaysThatInYear()
{
countYear = 1;
while(countYear<year)
{
if(leapYearCheck(countYear)== true)
noOfDays += 366;
else
noOfDays += 365;
countYear ++;
}
}
void noOfDaysAndDayName()
{
System.out.println("The noOfDays is"+noOfDays);
System.out.println("And Your Day is :");
int day;
day = (int)(noOfDays%7);
switch(day)
{
case 0:
System.out.println("Sunday");
break;
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
case 3:
System.out.println("Wednesday");
break;
case 4:
System.out.println("Thursday");
break;
case 5:
System.out.println("Friday");
break;
case 6:
System.out.println("Saturday");
break;
}
}
}// end of MonthToDate class
public class Main
{
public static void main(String args[])
{
DayDisplayer dd= new DayDisplayer();
dd.getDaysThatInYear();
dd.getDaysThatInMonth();
dd.getDaysThatInDays();
dd.noOfDaysAndDayName();
}
}
在这段代码中,当我以01/01/0001作为星期一并计算其他日子。我正在得到正确的答案。
但在www.timeanddate.com网站上,他们把01/01/0001作为星期六。 但是对于其他最近的日期(比如17/7/2011),他们正在给出正确的答案(如星期天)。
我可以猜测这些滞后是由于Julier系统迁移到了公历系统。
但我怀疑我的计算从0001年开始的天数是否正确?
此外,我怀疑是否采取01/01/0001日期是星期一或星期六。 (如果我把星期六作为我的第一天,我得到错误的答案。)
有人请解释。
在此先感谢。
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