下个月的第一天用java Joda-Time [英] First day of next month with java Joda-Time

问题描述

如何重写以下方法，该方法返回下个月的第一天， org.joda.time /www.joda.org/joda-time/\"> Joda-Time ？

How would you rewrite the method below, which returns the first day of next month, with the org.joda.time package in Joda-Time?

public static Date firstDayOfNextMonth() {
    Calendar nowCal = Calendar.getInstance();
    int month = nowCal.get(Calendar.MONTH) + 1;
    int year = nowCal.get(Calendar.YEAR);

    Calendar cal = Calendar.getInstance();
    cal.clear();
    cal.set(Calendar.YEAR, year);
    cal.set(Calendar.MONTH, month);
    cal.set(Calendar.DAY_OF_MONTH, 1);
    Date dueDate = new Date(cal.getTimeInMillis());

    return dueDate;
}

推荐答案

   LocalDate today = new LocalDate();
   LocalDate d1 = today.plusMonths(1).withDayOfMonth(1);

有点容易和清洁，不是吗？ ： - ）

A little easier and cleaner, isn't it? :-)

更新：如果您想要返回日期：

Update: If you want to return a date:

return new Date(d1.toDateTimeAtStartOfDay().getMillis());

但我强烈建议您避免混用纯DATE类型（即日历中的一天，信息）与DATETIME类型，特别是一个物理日期时间类型，像丑陋的 java.util.Date 。它有点像从转换为整型和浮动类型，你一定要小心。

but I strongly advise you to avoid mixing pure DATE types (i.e. a day in the calendar, without time information) with DATETIME types, specially with a "physical" datetime type as is the hideous java.util.Date . It's somewhat like converting from-to integer and floating types, you must be careful.

这篇关于下个月的第一天用java Joda-Time的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！