Java:检查指定日期是否在当月内 [英] Java: check if a given date is within current month

问题描述

我需要检查给定的日期是否在当月，我编写了以下代码，但是IDE提醒我

I need to check if a given date falls in the current month, and I wrote the following code, but the IDE reminded me that the getMonth() and getYear() methods are obsolete. I was wondering how to do the same thing in newer Java 7 or Java 8.

private boolean inCurrentMonth(Date givenDate) {
    Date today = new Date();

    return givenDate.getMonth() == today.getMonth() && givenDate.getYear() == today.getYear();
}

推荐答案

时区

其他答案忽略了时区的关键问题.巴黎比蒙特利尔早到了新的一天.因此，在同一时刻，日期是不同的，明天"在巴黎，而昨天"在蒙特利尔.

Time Zone

The other answers ignore the crucial issue of time zone. A new day dawns earlier in Paris than in Montréal. So at the same simultaneous moment, the dates are different, "tomorrow" in Paris while "yesterday" in Montréal.

与Java捆绑在一起的java.util.Date和.Calendar类非常麻烦，令人困惑和有缺陷.避免他们.

The java.util.Date and .Calendar classes bundled with Java are notoriously troublesome, confusing, and flawed. Avoid them.

请改为使用 Joda-Time 库或Java 8中的java.time包(受Joda-Time启发).

Instead use either Joda-Time library or the java.time package in Java 8 (inspired by Joda-Time).

以下是Joda-Time 2.5中的示例代码.

Here is example code in Joda-Time 2.5.

DateTimeZone zone = DateTimeZone.forID( "America/Montreal" );
DateTime dateTime = new DateTime( yourJUDate, zone );  // Convert java.util.Date to Joda-Time, and assign time zone to adjust.
DateTime now = DateTime.now( zone );
// Now see if the month and year match.
if ( ( dateTime.getMonthOfYear() == now.getMonthOfYear() ) && ( dateTime.getYear() == now.getYear() ) ) {
    // You have a hit.
}

要获得更通用的解决方案以查看某个时刻是否落在任何时间范围内(而不仅仅是一个月)，请在StackOverflow中搜索"joda"，"interval"和"contain".

For a more general solution to see if a moment falls within any span of time (not just a month), search StackOverflow for "joda" and "interval" and "contain".

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