如何在一个月内获得序数平日 [英] How to get ordinal Weekdays in a Month
问题描述
嗨我想在java中创建一个程序,其中days,weekNo是参数..类似于月的第一个星期五或月的第二个星期一..它返回日期
hi i want to make a program in java where days,weekNo is parameter ..Like First Friday of the month or second Monday of the month ..and it returns the date
推荐答案
这是一个实用方法,使用 DateUtils
rel =nofollow> Apache Commons / Lang :
Here's a utility method that does that, using DateUtils
from Apache Commons / Lang:
/**
* Get the n-th x-day of the month in which the specified date lies.
* @param input the specified date
* @param weeks 1-based offset (e.g. 1 means 1st week)
* @param targetWeekDay (the weekday we're looking for, e.g. Calendar.MONDAY
* @return the target date
*/
public static Date getNthXdayInMonth(final Date input,
final int weeks,
final int targetWeekDay){
// strip all date fields below month
final Date startOfMonth = DateUtils.truncate(input, Calendar.MONTH);
final Calendar cal = Calendar.getInstance();
cal.setTime(startOfMonth);
final int weekDay = cal.get(Calendar.DAY_OF_WEEK);
final int modifier = (weeks - 1) * 7 + (targetWeekDay - weekDay);
return modifier > 0
? DateUtils.addDays(startOfMonth, modifier)
: startOfMonth;
}
测试代码:
// Get this month's third thursday
System.out.println(getNthXdayInMonth(new Date(), 3, Calendar.THURSDAY));
// Get next month's second wednesday:
System.out.println(getNthXdayInMonth(DateUtils.addMonths(new Date(), 1),
2,
Calendar.WEDNESDAY)
);
输出:
Thu Nov 18 00:00:00 CET 2010
Wed Dec 08 00:00:00 CET 2010
Thu Nov 18 00:00:00 CET 2010
Wed Dec 08 00:00:00 CET 2010
这里有一个 JodaTime 相同代码的版本(我之前从未使用过JodaTime,所以可能有一种更简单的方法):
And here's a JodaTime version of the same code (I've never used JodaTime before, so there's probably a simpler way to do it):
/**
* Get the n-th x-day of the month in which the specified date lies.
*
* @param input
* the specified date
* @param weeks
* 1-based offset (e.g. 1 means 1st week)
* @param targetWeekDay
* (the weekday we're looking for, e.g. DateTimeConstants.MONDAY
* @return the target date
*/
public static DateTime getNthXdayInMonthUsingJodaTime(final DateTime input,
final int weeks,
final int targetWeekDay){
final DateTime startOfMonth =
input.withDayOfMonth(1).withMillisOfDay(0);
final int weekDay = startOfMonth.getDayOfWeek();
final int modifier = (weeks - 1) * 7 + (targetWeekDay - weekDay);
return modifier > 0 ? startOfMonth.plusDays(modifier) : startOfMonth;
}
测试代码:
// Get this month's third thursday
System.out.println(getNthXdayInMonthUsingJodaTime(new DateTime(),
3,
DateTimeConstants.THURSDAY));
// Get next month's second wednesday:
System.out.println(getNthXdayInMonthUsingJodaTime(new DateTime().plusMonths(1),
2,
DateTimeConstants.WEDNESDAY));
输出:
2010-11-18T00:00:00.000 + 01:00
2010-12-08T00:00:00.000 + 01:00
2010-11-18T00:00:00.000+01:00
2010-12-08T00:00:00.000+01:00
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