Question

String specificDate=2013+"-"+06+"-"+20;
String day="Monday";

如何找到星期一到来的specificDate之后的下一个日期？

Answer 1

您要么看Java's Calendar或JodaTime，因为您正在查看日期规则，我建议Joda。

Answer 2

 Calendar now = Calendar.getInstance();  
 SimpleDateFormat sdf = new SimpleDateFormat(formatString);
 now.setTime(sdf.parse(dateString));
 int weekday = now.get(Calendar.DAY_OF_WEEK);  
 if (weekday != Calendar.MONDAY)  
 {  

     int days = (Calendar.SATURDAY - weekday + 2) % 7;  
     now.add(Calendar.DAY_OF_YEAR, days);  
 }  
 Date monday = now.getTime();

Answer 3

您应该使用更高级别的日期库来为您执行此操作。不幸的是，java内置的Date和Calendar类远不够理想。您可以看一下这个库，它已经成为Java开发人员日期操作的事实标准，直到新的JDK设计完成为止。

http://joda-time.sourceforge.net/

Answer 4

您应该使用Calendar类。

Calendar c1 = Calendar.getInstance();  
c1.set(2013, Calendar.JUNE, 20);

int weekday = now.get(Calendar.DAY_OF_WEEK);  
if (weekday != Calendar.MONDAY) {
    // calculate how much to add
    // the 2 is the difference between Saturday and Monday
    int days = (Calendar.SATURDAY - weekday + 2) % 7;
    now.add(Calendar.DAY_OF_YEAR, days);
}

Answer 5

试试这个

    Calendar c = new GregorianCalendar(2013, 5, 20);
    int diff = Calendar.MONDAY - c.get(Calendar.DAY_OF_WEEK);
    if (diff < 0) {
        diff = 7 + diff;
    }
    c.add(Calendar.DATE, diff);
    Date monday = c.getTime();

Answer 6

使用标准API执行此操作的最简单方法是将星期几设置为星期一，然后提前一周：

Calendar c = Calendar.getInstance();
c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); // Sets c to this week's Monday
c.add(Calendar.DATE, 7);                      // Advances c to next week's Monday

请注意，如果您的文化中一周的第一天是星期日，而您的开始日期是星期日，则set方法会将日期移至下一个星期一 - 而不是前一个星期一 - 并且您结束在给定日期之后计算第二个星期一。如果一周的第一天是星期一，一切都按预期工作。

Answer 7

对于Java 8，您可以使用类似......

的内容

LocalDate date = LocalDate.of(2013, Month.JUNE, 20);
LocalDate nextWed2 = date.with(TemporalAdjusters.nextOrSame(DayOfWeek.MONDAY));

...或

LocalDate date = LocalDate.of(2013, Month.JUNE, 20);
LocalDate nextWed2 = date.with(TemporalAdjusters.next(DayOfWeek.MONDAY));

如果选择日期为MONDAY，但您想要下一个MONDAY

更详细地展示了here

或者如果您更喜欢使用JodaTime ......

    LocalDate date = new LocalDate(2013, DateTimeConstants.JUNE, 20);
    LocalDate nextMonday = new LocalDate(date);
    if (date.getDayOfWeek() >= DateTimeConstants.FRIDAY) {
        nextMonday = date.plusWeeks(1);
    }
    nextMonday = nextMonday.withDayOfWeek(DateTimeConstants.FRIDAY);

哪个基于this answer

如何使用java在特定日期之后找到某个特定日期的下一个日期？

7 个答案: