blocks|key|1165428|text|以下是Java+7或更高版本的解决方案(否则，我建议检查其他答案)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1165429|private+static+Date+getFirstDayOfQuarter(Date+date)+{
++++Calendar+cal+=+Calendar.getInstance();
++++cal.setTime(date);
++++cal.set(Calendar.DAY_OF_MONTH,+1);
++++cal.set(Calendar.MONTH,+cal.get(Calendar.MONTH)/3+*+3);
++++return+cal.getTime();
}

private+static+Date+getLastDayOfQuarter(Date+date)+{
++++Calendar+cal+=+Calendar.getInstance();
++++cal.setTime(date);
++++cal.set(Calendar.DAY_OF_MONTH,+1);
++++cal.set(Calendar.MONTH,+cal.get(Calendar.MONTH)/3+*+3+%2B+2);
++++cal.set(Calendar.DAY_OF_MONTH,+cal.getActualMaximum(Calendar.DAY_OF_MONTH));
++++return+cal.getTime();
}|code-block|syntax|javascript|1165430|注1:月在java.util.Calendar中表示为从0(1月)到11+(12月)的整数|offset|length|style|BOLD|1165431|注释2:+Java中整数的除法会产生地板值(另一个整数值)。2/3+=+0，4/3+=1，以此类推。因此，cal.get(Calendar.MONTH)/3+*+3计算的零基指数为:+0(Q1)，1(Q2)，2(Q3)，3(Q4).|CODE|1165432|例句:日历中的2月为1.so，1/3*3=+0。|1165433|如果提供2月日期，则季度开始日期为1月1日(因为我们得到0)，季度末为0%2B2=2+(Mar)。|1165434|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html^0|0|0|0|3|5|I|0|0|0|D|1H|T|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|13|8|@$I|14|J|15|K|L]]|9|@$I|16|J|17|1|18]]|A|$]]|$1|M|3|N|5|6|7|19|8|@$I|1A|J|1B|K|L]|$I|1C|J|1D|K|O]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1E|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1F|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]]]

Here is solution in Java 7 or older (otherwise, I suggest to check other answers):
<pre><code>private static Date getFirstDayOfQuarter(Date date) {
 Calendar cal = Calendar.getInstance();
 cal.setTime(date);
 cal.set(Calendar.DAY_OF_MONTH, 1);
 cal.set(Calendar.MONTH, cal.get(Calendar.MONTH)/3 * 3);
 return cal.getTime();
}

private static Date getLastDayOfQuarter(Date date) {
 Calendar cal = Calendar.getInstance();
 cal.setTime(date);
 cal.set(Calendar.DAY_OF_MONTH, 1);
 cal.set(Calendar.MONTH, cal.get(Calendar.MONTH)/3 * 3 + 2);
 cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
 return cal.getTime();
}
</code></pre>
Note 1: Months in <a href="https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html" rel="nofollow noreferrer">java.util.Calendar</a> are represented as integers starting from 0 (Jan) through 11 (Dec) 
Note 2: division of integers in Java results in floor value (another integer value). So 2/3 = 0, 4/3 = 1 and so forth.
So, <code>cal.get(Calendar.MONTH)/3 * 3</code> calculates zero-based index of quarter: 0(Q1), 1(Q2), 2(Q3), 3(Q4). 
Example: Feb in Calendar is 1. So, 1 / 3 * 3 = 0. 
If Feb date is supplied, then start of the quarter is 1st of Jan (because we got 0) and the end of quarter is last day of month 0 + 2 = 2 (Mar)

blocks|key|610422|text|你可以使用joda：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|610423|Date+start+=+date.withMonthOfYear(((date.getMonthOfYear()+/+3)+%2B+1)+*+3+-+2)
++++++++++++.withDayOfMonth(1)
++++++++++++.withTimeAtStartOfDay()
++++++++++++.toDate();
Date+end+=+date.withMonthOfYear(((date.getMonthOfYear()+/+3)+%2B+1)+*+3)
++++++++++++.withDayOfMonth(Month.of(((date.getMonthOfYear()+/+3)+%2B+1)+*+3).maxLength())
++++++++++++.withTimeAtStartOfDay()
++++++++++++.toDate();|code-block|syntax|javascript|610424|当DateTime+date+=新DateTime(2016、8、12、1、1、1)；|610425|我得到：|610426|Fri+Jul+01+00:00:00+CEST+2016
Fri+Sep+30+00:00:00+CEST+2016|610427|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can use joda:

<pre><code>Date start = date.withMonthOfYear(((date.getMonthOfYear() / 3) + 1) * 3 - 2)
 .withDayOfMonth(1)
 .withTimeAtStartOfDay()
 .toDate();
Date end = date.withMonthOfYear(((date.getMonthOfYear() / 3) + 1) * 3)
 .withDayOfMonth(Month.of(((date.getMonthOfYear() / 3) + 1) * 3).maxLength())
 .withTimeAtStartOfDay()
 .toDate();
</code></pre>

When DateTime date = new DateTime(2016, 8, 12, 1, 1, 1);

I get:

<pre><code>Fri Jul 01 00:00:00 CEST 2016
Fri Sep 30 00:00:00 CEST 2016
</code></pre>

blocks|key|1165552|text|正如其他人提到的，您正在使用过时的类。Sun/Oracle决定用java.time框架取代旧的日期时间类，这是一个巨大的改进。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1165553|避免使用旧的日期-时间类。它们确实设计得很糟糕，令人困惑，也很麻烦。|1165554|java.time|1165555|java.time框架内置在Java8中，对于Java6&+7，使用后台端口三次-支持。对于Android来说，它是对后端端口ThreeTenABP的改造。|offset|length|1165556|java.time框架的灵感来源于由JSR+310定义的高度成功的Joda-Time库，并由ThreeTen额外项目扩展。见Oracle教程。|1165557|LocalDate|style|CODE|1165558|对于只有日期的值，没有一天的时间，也没有时区，使用LocalDate内置作为java.time的一部分。要获得当前的日期，需要一个时区，因为日期在世界各地都有变化(东方新的一天会提前到来)。|1165559|ZoneId+zoneId+=+ZoneId.of+(+"America/Montreal"+);
LocalDate+today+=+LocalDate.now+(+zoneId+);|code-block|syntax|javascript|1165560|Quarter+&+YearQuarter|1165561|上面提到的三次-额外项目是将来可能添加到java.time中的特性的试验场。要使用这个库，请将其jar文件添加到您的项目中(或使用Maven等)。如果您真的不想添加库，请参阅备选解决方案dheeran回答。|1165562|这个库目前包括您可能认为特别有用的Quarter和YearQuarter类。在代码中传递这些类型的对象比使用字符串和数字来表示季度更安全。|1165563|YearQuarter+currentQuarter+=+YearQuarter.now+(+zoneId+);|1165564|YearQuarter有许多有用的方法，包括询问日期。|1165565|LocalDate+start+=+currentQuarter.atDay+(+1+);
LocalDate+stop+=+currentQuarter.atEndOfQuarter+();|1165566|转储到控制台。|1165567|System.out.println+(+"today:+"+%2B+today+%2B+"+currentQuarter:+"+%2B+currentQuarter+%2B+"+start:+"+%2B+start+%2B+"+stop:+"+%2B+stop+);|1165568|今日:+2016-04-08+currentQuarter:+2016-Q2开始:+2016-04-01停:+2016-06-30|blockquote|1165569|如果您真的不想像我建议的那样添加ThreeTen额外的库，请参阅帕维尔的回答以获得另一种解决方案，只使用内置的java.time类。但是，如果你做了大量的工作，我相信你会发现三倍-额外的是值得的麻烦，增加一个库到您的项目。|1165570|转换|1165571|如果必须使用java.util.Date来处理尚未更新为java.time的旧代码，则可以来回转换。查找添加到旧类中的新方法以进行转换。|1165572|不幸的是，旧类缺乏任何表示日期唯一值的干净方法。因此，没有完全干净的方式可以到达/离开LocalDate。|1165573|java.sql.Date|1165574|java.sql.Date类假装是仅限日期的，但实际上包含一个经过00:00:00.0调整的时间。这个类笨拙地继承自java.util.Date，但文档显然警告不要使用这个事实；您应该将这两个类视为独立的无关类。|1165575|java.sql.Date+sqlDate_quarterStart+=+java.sql.Date.valueOf(+start+);|1165576|java.util.Date|1165577|java.util.Date既代表一天的日期，又代表一天的时间，在世界协调时是有效的.我们可以首先将LocalDate调整为一天中的第一分钟，以得到一天中有时间的日期，即ZonedDateTime。从那里，我们可以要求一个Instant，这是时间线上的一个时刻，在世界协调时。旧的.Date类有一个静态from(+Instant+)转换方法。|1165578|ZonedDateTime+zdt+=+start.atStartOfDay(+zoneId+);+//+First+moment+of+the+day+on+a+certain+date.
Instant+instant+=+zdt.toInstant();+//+Moment+on+the+timeline+in+UTC.
java.util.Date+utilDate+=+java.util.Date.from(+instant+);|1165579|关于java.time|1165580|http://docs.oracle.com/javase/10/docs/api/java/time/package-summary.html框架内置到Java8和更高版本中。这些类取代了麻烦的旧遗赠日期时间类，如java.util.Date、Calendar和SimpleDateFormat。|1165581|http://www.joda.org/joda-time/项目现在在维护模式中，建议迁移到java.time类。|1165582|要了解更多信息，请参见http://docs.oracle.com/javase/tutorial/datetime/TOC.html。并搜索堆栈溢出以获得许多示例和解释。规范是JSR+310。|1165583|您可以直接与数据库交换java.time对象。使用与JDBC+4.2或更高版本兼容的JDBC+4.2。不需要字符串，也不需要java.sql.*类。|1165584|在哪里获得java.time类？|1165585|Java+8，Java+9，Java+10，以及后来的|unordered-list-item|1165586|内置的。|1165587|带有捆绑实现的标准Java的一部分。|1165588|Java+9添加了一些次要的特性和修复。|1165589|1165590|​|1165591|Java+6和Java+7+|1165592|java.time的大部分功能都是在http://www.threeten.org/threetenbp/中移植到Java6&7中的。|1165593|1165594|1165595|安卓+|1165596|较晚版本的Android实现的java.time类。|1165597|对于早期的Android+(<26)，https://github.com/JakeWharton/ThreeTenABP项目采用了ThreeTen(上面提到的)。见http://stackoverflow.com/q/38922754/642706。|1165598|1165599|1165600|三次-额外项目使用其他类扩展java.time。这个项目是将来可能加入java.time的试验场。您可以在这里找到一些有用的类，如Interval、YearWeek、YearQuarter和更多。|1165601|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/8/docs/api/java/time/package-summary.html|1|http://www.threeten.org/threetenbp/|2|https://github.com/JakeWharton/ThreeTenABP|3|4|http://docs.oracle.com/javase/8/docs/api/java/time/LocalDate.html|5|http://www.threeten.org/threeten-extra/|6|https://stackoverflow.com/a/52159420/642706|7|http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/Quarter.html|8|http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/YearQuarter.html|9|https://stackoverflow.com/a/50702885/642706|10|http://docs.oracle.com/javase/8/docs/api/java/sql/Date.html|11|http://docs.oracle.com/javase/8/docs/api/java/util/Date.html|12|http://docs.oracle.com/javase/10/docs/api/java/time/package-summary.html|13|https://en.wikipedia.org/wiki/Legacy_system|14|https://docs.oracle.com/javase/10/docs/api/java/util/Date.html|15|https://docs.oracle.com/javase/10/docs/api/java/util/Calendar.html|16|http://docs.oracle.com/javase/10/docs/api/java/text/SimpleDateFormat.html|17|http://www.joda.org/joda-time/|18|https://en.wikipedia.org/wiki/Maintenance_mode|19|20|http://docs.oracle.com/javase/tutorial/datetime/TOC.html|21|https://jcp.org/en/jsr/detail?id=310|22|http://openjdk.java.net/jeps/170|23|24|https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8|25|https://en.wikipedia.org/wiki/Java_version_history#Java_SE_9|26|https://en.wikipedia.org/wiki/Java_version_history#Java_SE_10|27|https://en.wikipedia.org/wiki/Java_version_history#Java_SE_6|28|https://en.wikipedia.org/wiki/Java_version_history#Java_SE_7|29|30|https://en.wikipedia.org/wiki/Android_(operating_system)|31|32|http://stackoverflow.com/q/38922754/642706|33|34|http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/Interval.html|35|http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/YearWeek.html|36|37|http://www.threeten.org/threeten-extra/apidocs/index.html^0|0|0|0|0|9|0|12|5|1|1R|B|2|0|1Q|8|3|0|0|9|0|P|9|P|9|4|0|0|0|7|A|B|0|5|5|5|2L|9|6|0|H|7|P|B|H|7|7|P|B|8|0|0|0|B|0|0|0|0|0|W|6|9|0|0|0|17|9|0|0|D|0|0|D|X|A|1M|E|0|D|A|0|0|0|E|0|0|E|1E|9|2D|D|33|7|47|F|0|E|B|0|0|0|30|E|3F|8|3O|G|0|20|C|2R|2|D|30|E|E|3F|8|F|3O|G|G|0|0|U|H|Z|4|I|1A|9|J|0|B|1K|K|2H|7|L|0|1Q|A|Q|8|M|16|8|N|0|0|0|6|O|7|6|P|E|7|Q|1|1|1|1|0|0|0|6|R|7|6|S|1|I|Z|T|1|0|0|0|2|U|1|1|J|16|V|2B|16|W|1|0|0|1T|8|22|8|2B|B|0|5|X|1T|8|Y|22|8|Z|2B|B|10|2N|2|11|0^^$0|@$1|2|3|4|5|6|7|56|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|57|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|58|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|59|8|@]|9|@$H|5A|I|5B|1|5C]|$H|5D|I|5E|1|5F]|$H|5G|I|5H|1|5I]]|A|$]]|$1|J|3|K|5|6|7|5J|8|@]|9|@$H|5K|I|5L|1|5M]]|A|$]]|$1|L|3|M|5|6|7|5N|8|@$H|5O|I|5P|N|O]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|5Q|8|@$H|5R|I|5S|N|O]]|9|@$H|5T|I|5U|1|5V]]|A|$]]|$1|R|3|S|5|T|7|5W|8|@]|9|@]|A|$U|V]]|$1|W|3|X|5|6|7|5X|8|@$H|5Y|I|5Z|N|O]|$H|60|I|61|N|O]]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|62|8|@]|9|@$H|63|I|64|1|65]|$H|66|I|67|1|68]]|A|$]]|$1|10|3|11|5|6|7|69|8|@$H|6A|I|6B|N|O]|$H|6C|I|6D|N|O]]|9|@$H|6E|I|6F|1|6G]|$H|6H|I|6I|1|6J]]|A|$]]|$1|12|3|13|5|T|7|6K|8|@]|9|@]|A|$U|V]]|$1|14|3|15|5|6|7|6L|8|@$H|6M|I|6N|N|O]]|9|@]|A|$]]|$1|16|3|17|5|T|7|6O|8|@]|9|@]|A|$U|V]]|$1|18|3|19|5|6|7|6P|8|@]|9|@]|A|$]]|$1|1A|3|1B|5|T|7|6Q|8|@]|9|@]|A|$U|V]]|$1|1C|3|1D|5|1E|7|6R|8|@]|9|@]|A|$]]|$1|1F|3|1G|5|6|7|6S|8|@]|9|@$H|6T|I|6U|1|6V]]|A|$]]|$1|1H|3|1I|5|6|7|6W|8|@]|9|@]|A|$]]|$1|1J|3|1K|5|6|7|6X|8|@]|9|@]|A|$]]|$1|1L|3|1M|5|6|7|6Y|8|@$H|6Z|I|70|N|O]]|9|@]|A|$]]|$1|1N|3|1O|5|6|7|71|8|@$H|72|I|73|N|O]]|9|@]|A|$]]|$1|1P|3|1Q|5|6|7|74|8|@$H|75|I|76|N|O]|$H|77|I|78|N|O]|$H|79|I|7A|N|O]]|9|@$H|7B|I|7C|1|7D]]|A|$]]|$1|1R|3|1S|5|T|7|7E|8|@]|9|@]|A|$U|V]]|$1|1T|3|1U|5|6|7|7F|8|@$H|7G|I|7H|N|O]]|9|@]|A|$]]|$1|1V|3|1W|5|6|7|7I|8|@$H|7J|I|7K|N|O]|$H|7L|I|7M|N|O]|$H|7N|I|7O|N|O]|$H|7P|I|7Q|N|O]|$H|7R|I|7S|N|O]]|9|@$H|7T|I|7U|1|7V]]|A|$]]|$1|1X|3|1Y|5|T|7|7W|8|@]|9|@]|A|$U|V]]|$1|1Z|3|20|5|6|7|7X|8|@]|9|@]|A|$]]|$1|21|3|22|5|6|7|7Y|8|@$H|7Z|I|80|N|O]|$H|81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As others mentioned, you are using outmoded classes. Sun/Oracle decided to supplant the old date-time classes with the java.time framework, a vast improvement.

Avoid the old date-time classes. They really are poorly designed, confusing, and troublesome.

<h1>java.time</h1>

The <a href="http://docs.oracle.com/javase/8/docs/api/java/time/package-summary.html" rel="nofollow noreferrer">java.time</a> framework is built into Java 8. For Java 6 &amp; 7, use the back-port, <a href="http://www.threeten.org/threetenbp/" rel="nofollow noreferrer">ThreeTen-Backport</a>. For Android, the adaptation of that back-port, <a href="https://github.com/JakeWharton/ThreeTenABP" rel="nofollow noreferrer">ThreeTenABP</a>. 

The java.time framework is inspired by the highly successful Joda-Time library, defined by JSR 310, and extended by the ThreeTen-Extra project. See <a href="http://docs.oracle.com/javase/8/docs/api/java/time/package-summary.html" rel="nofollow noreferrer">Oracle Tutorial</a>.

<h1><code>LocalDate</code></h1>

For a date-only value, without time-of-day and without time zone, use <a href="http://docs.oracle.com/javase/8/docs/api/java/time/LocalDate.html" rel="nofollow noreferrer"><code>LocalDate</code></a> built-in as part of java.time. To get the current date requires a time zone as the date varies around the world (a new day dawns earlier in the east).

<pre><code>ZoneId zoneId = ZoneId.of ( "America/Montreal" );
LocalDate today = LocalDate.now ( zoneId );
</code></pre>

<h1><code>Quarter</code> &amp; <code>YearQuarter</code></h1>

The <a href="http://www.threeten.org/threeten-extra/" rel="nofollow noreferrer">ThreeTen-Extra</a> project mentioned above serves as the proving ground for possible future features to be added to java.time. To use this library, add its jar file to your project (or use Maven etc.). If you really don’t want to add a library, see an alternate solution <a href="https://stackoverflow.com/a/52159420/642706">Answer by dheeran</a>.

This library currently includes the <a href="http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/Quarter.html" rel="nofollow noreferrer"><code>Quarter</code></a> and <a href="http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/YearQuarter.html" rel="nofollow noreferrer"><code>YearQuarter</code></a> classes that you might find particularly useful. Safer to pass around objects of these types in your code rather than use strings and numbers to represent your quarters. 

<pre><code>YearQuarter currentQuarter = YearQuarter.now ( zoneId );
</code></pre>

The <code>YearQuarter</code> has many useful methods, including asking for its dates.

<pre><code>LocalDate start = currentQuarter.atDay ( 1 );
LocalDate stop = currentQuarter.atEndOfQuarter ();
</code></pre>

Dump to console.

<pre><code>System.out.println ( "today: " + today + " currentQuarter: " + currentQuarter + " start: " + start + " stop: " + stop );
</code></pre>

<blockquote>
 today: 2016-04-08 currentQuarter: 2016-Q2 start: 2016-04-01 stop: 2016-06-30
</blockquote>

If you really do not want to add the ThreeTen-Extra library as I recommended, see the <a href="https://stackoverflow.com/a/50702885/642706">Answer by Pavel</a> for another solution using only the built-in java.time classes. But if you are doing much work with quarters, I am sure you’ll find ThreeTen-Extra to be well worth the trouble of adding a library to your project.

<h1>Conversion</h1>

If you must use java.util.Date to work with old code not yet updated to java.time, you can convert back and forth. Find new methods added to the old classes for conversion.

Unfortunately, the old classes lack any clean way to represent a date-only value. So there is no perfectly clean way to go to/from a <code>LocalDate</code>.

<h2><code>java.sql.Date</code></h2>

The <a href="http://docs.oracle.com/javase/8/docs/api/java/sql/Date.html" rel="nofollow noreferrer"><code>java.sql.Date</code></a> class pretends to be a date-only but actually contains a time-of-day adjusted to <code>00:00:00.0</code>. This class awkwardly inherits from <code>java.util.Date</code> but the doc clearly warns against using that fact; you are supposed to treat the two as separate unrelated classes.

<pre><code>java.sql.Date sqlDate_quarterStart = java.sql.Date.valueOf( start );
</code></pre>

<h2><code>java.util.Date</code></h2>

A <a href="http://docs.oracle.com/javase/8/docs/api/java/util/Date.html" rel="nofollow noreferrer"><code>java.util.Date</code></a> represents both a date and time-of-day, effectively in UTC. We can first adjust our <code>LocalDate</code> into the first moment of a day to get a date with time-of-day, a <code>ZonedDateTime</code>. From there we can ask for an <code>Instant</code> which is a moment on the timeline in UTC. The old .Date class has a static <code>from( Instant )</code> conversion method.

<pre><code>ZonedDateTime zdt = start.atStartOfDay( zoneId ); // First moment of the day on a certain date.
Instant instant = zdt.toInstant(); // Moment on the timeline in UTC.
java.util.Date utilDate = java.util.Date.from( instant );
</code></pre>

<hr>

<h1>About java.time</h1>

The <a href="http://docs.oracle.com/javase/10/docs/api/java/time/package-summary.html" rel="nofollow noreferrer">java.time</a> framework is built into Java 8 and later. These classes supplant the troublesome old <a href="https://en.wikipedia.org/wiki/Legacy_system" rel="nofollow noreferrer">legacy</a> date-time classes such as <a href="https://docs.oracle.com/javase/10/docs/api/java/util/Date.html" rel="nofollow noreferrer"><code>java.util.Date</code></a>, <a href="https://docs.oracle.com/javase/10/docs/api/java/util/Calendar.html" rel="nofollow noreferrer"><code>Calendar</code></a>, &amp; <a href="http://docs.oracle.com/javase/10/docs/api/java/text/SimpleDateFormat.html" rel="nofollow noreferrer"><code>SimpleDateFormat</code></a>.

The <a href="http://www.joda.org/joda-time/" rel="nofollow noreferrer">Joda-Time</a> project, now in <a href="https://en.wikipedia.org/wiki/Maintenance_mode" rel="nofollow noreferrer">maintenance mode</a>, advises migration to the <a href="http://docs.oracle.com/javase/10/docs/api/java/time/package-summary.html" rel="nofollow noreferrer">java.time</a> classes.

To learn more, see the <a href="http://docs.oracle.com/javase/tutorial/datetime/TOC.html" rel="nofollow noreferrer">Oracle Tutorial</a>. And search Stack Overflow for many examples and explanations. Specification is <a href="https://jcp.org/en/jsr/detail?id=310" rel="nofollow noreferrer">JSR 310</a>.

You may exchange java.time objects directly with your database. Use a <a href="https://en.wikipedia.org/wiki/JDBC_driver" rel="nofollow noreferrer">JDBC driver</a> compliant with <a href="http://openjdk.java.net/jeps/170" rel="nofollow noreferrer">JDBC 4.2</a> or later. No need for strings, no need for <code>java.sql.*</code> classes.

Where to obtain the java.time classes? 

<ul>
<li><a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8" rel="nofollow noreferrer">Java SE 8</a>, <a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_9" rel="nofollow noreferrer">Java SE 9</a>, <a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_10" rel="nofollow noreferrer">Java SE 10</a>, and later

<ul>
<li>Built-in. </li>
<li>Part of the standard Java API with a bundled implementation.</li>
<li>Java 9 adds some minor features and fixes.</li>
</ul></li>
<li><a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_6" rel="nofollow noreferrer">Java SE 6</a> and <a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_7" rel="nofollow noreferrer">Java SE 7</a>

<ul>
<li>Much of the java.time functionality is back-ported to Java 6 &amp; 7 in <a href="http://www.threeten.org/threetenbp/" rel="nofollow noreferrer">ThreeTen-Backport</a>.</li>
</ul></li>
<li><a href="https://en.wikipedia.org/wiki/Android_(operating_system)" rel="nofollow noreferrer">Android</a>

<ul>
<li>Later versions of Android bundle implementations of the java.time classes.</li>
<li>For earlier Android (&lt;26), the <a href="https://github.com/JakeWharton/ThreeTenABP" rel="nofollow noreferrer">ThreeTenABP</a> project adapts ThreeTen-Backport (mentioned above). See <a href="http://stackoverflow.com/q/38922754/642706">How to use ThreeTenABP…</a>.</li>
</ul></li>
</ul>

The <a href="http://www.threeten.org/threeten-extra/" rel="nofollow noreferrer">ThreeTen-Extra</a> project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as <a href="http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/Interval.html" rel="nofollow noreferrer"><code>Interval</code></a>, <a href="http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/YearWeek.html" rel="nofollow noreferrer"><code>YearWeek</code></a>, <a href="http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/YearQuarter.html" rel="nofollow noreferrer"><code>YearQuarter</code></a>, and <a href="http://www.threeten.org/threeten-extra/apidocs/index.html" rel="nofollow noreferrer">more</a>.

blocks|key|1165642|text|纯Java-8%2B解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1165643|LocalDate+localDate+=+LocalDate.now();
LocalDate+firstDayOfQuarter+=+localDate.with(localDate.getMonth().firstMonthOfQuarter())
++++.with(TemporalAdjusters.firstDayOfMonth());

LocalDate+lastDayOfQuarter+=+firstDayOfQuarter.plusMonths(2)
++++.with(TemporalAdjusters.lastDayOfMonth());|code-block|syntax|javascript|1165644|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Pure Java-8+ solution:

<pre><code>LocalDate localDate = LocalDate.now();
LocalDate firstDayOfQuarter = localDate.with(localDate.getMonth().firstMonthOfQuarter())
 .with(TemporalAdjusters.firstDayOfMonth());

LocalDate lastDayOfQuarter = firstDayOfQuarter.plusMonths(2)
 .with(TemporalAdjusters.lastDayOfMonth());
</code></pre>

blocks|key|410737|text|使用LocalDate非常简单|type|unstyled|depth|inlineStyleRanges|entityRanges|data|410738|LocalDate+inputDate+=+LocalDate.parse("2018-09-04");
LocalDate+firstDayOfQuarter+=+inputDate.withMonth(inputDate.get(IsoFields.QUARTER_OF_YEAR)+*+3+-+2).with(TemporalAdjusters.firstDayOfMonth());
LocalDate+lastDayOfQuarter+=+inputDate.withMonth(inputDate.get(IsoFields.QUARTER_OF_YEAR)+*+3).with(TemporalAdjusters.lastDayOfMonth());|code-block|syntax|javascript|410739|干杯!|410740|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

It's pretty simple with LocalDate

<pre><code>LocalDate inputDate = LocalDate.parse("2018-09-04");
LocalDate firstDayOfQuarter = inputDate.withMonth(inputDate.get(IsoFields.QUARTER_OF_YEAR) * 3 - 2).with(TemporalAdjusters.firstDayOfMonth());
LocalDate lastDayOfQuarter = inputDate.withMonth(inputDate.get(IsoFields.QUARTER_OF_YEAR) * 3).with(TemporalAdjusters.lastDayOfMonth());
</code></pre>

Cheers!

blocks|key|612830|text|您可以使用java+8+LocaDate获取当前季度的第一天和最后一天。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|612831|下面的代码给你。|612832|public+static+LocalDate+getCurrentQuarterStartDay(LocalDate+date)+{
++++++++return+date.with(IsoFields.DAY_OF_QUARTER,+1L);
++++}

public+static+LocalDate+getCurrentQuarterEndDate(LocalDate+date)+{
++++++++return+date.with(IsoFields.DAY_OF_QUARTER,+92L);
++++}|code-block|syntax|javascript|612833|在第二种方法中，92有部分宽大。|612834|季度的数值在标准年的Q1从1到90，在闰年的Q1从1到91，在Q2中从1到91，在Q3和Q4中从1到92。|612835|详细信息请参见ISOFields文档这里|offset|length|612836|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.oracle.com/javase/8/docs/api/java/time/temporal/IsoFields.html#QUARTER_OF_YEAR^0|0|0|0|0|0|I|2|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|13|8|@]|9|@$O|14|P|15|1|16]]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

you can use java 8 LocaDate to get current quarter first and last day

The code below gives you. 

<pre><code>public static LocalDate getCurrentQuarterStartDay(LocalDate date) {
 return date.with(IsoFields.DAY_OF_QUARTER, 1L);
 }

public static LocalDate getCurrentQuarterEndDate(LocalDate date) {
 return date.with(IsoFields.DAY_OF_QUARTER, 92L);
 }
</code></pre>

Here in second method the 92 has partially lenient

The day-of-quarter has values from 1 to 90 in Q1 of a standard year, from 1 to 91in Q1 of a leap year, from 1 to 91 in Q2 and from 1 to 92 in Q3 and Q4

see ISOFields documentation for details <a href="https://docs.oracle.com/javase/8/docs/api/java/time/temporal/IsoFields.html#QUARTER_OF_YEAR" rel="nofollow noreferrer">here</a>

blocks|key|1165697|text|使用使用java.util.Date的Volodymyr+Masliy的答案，如果您输入"31/05/2000“，它将返回那年的7月1日，这显然不是我们要寻找的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1165698|按照Bourque和dheeran的建议，我使用了java.time.LocalDate，测试用例正常。|1165699|我的方法如下：|1165700|public+static+Date+lastDayOfQuarter(Date+date)+{
++++LocalDate+inputDate+=+date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
++++LocalDate+lastDayOfQuarter+=+inputDate.withMonth(inputDate.get(IsoFields.QUARTER_OF_YEAR)+*+3).with(TemporalAdjusters.lastDayOfMonth());
++++return+Date.from(LastDayOfQuarter.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());
}|code-block|syntax|javascript|1165701|我使用ZohhakRunner的ZohhakRunner如下所示：|1165702|@TestWith({
++++"01/03/2000,+31/03/2000",
++++"05/04/1982,+30/06/1982",
++++"31/05/1982,+30/06/1982",
++++"09/07/1990,+30/09/1990",
++++"11/11/2019,+31/12/2019",
++++"31/03/2016,+31/03/2016"})
public+void+lastDayOfQuarter_useInputDate_returnExpectedEndOfQuarterDate(String+inputDateAsString,+String+endOfQuarterAsString)+throws+ParseException{
++++Date+inputDate+=+new+SimpleDateFormat("dd/MM/yyyy").parse(inputDateAsString);
++++Date+expectedDate+=+new+SimpleDateFormat("dd/MM/yyyy").parse(endOfQuarterAsString);

++++Date+result+=+DateUtils.lastDayOfQuarter(inputDate);
++++assertEquals(result,+expectedDate);
}|1165703|entityMap^0|4|E|0|P|J|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|10|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|11|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|12|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|13|8|@]|D|@]|E|$M|N]]|$1|S|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|T|$]]

Using the answer from Volodymyr Masliy using <code>java.util.Date</code>, there is some bug that came up in my tests
If you enter "31/05/2000" it returns July 1st of that year, which is obviously not what we're looking for.

I used <code>java.time.LocalDate</code> as suggested by Basil Bourque and dheeran and the test case works ok.

My method is as follows:

<pre><code>public static Date lastDayOfQuarter(Date date) {
 LocalDate inputDate = date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
 LocalDate lastDayOfQuarter = inputDate.withMonth(inputDate.get(IsoFields.QUARTER_OF_YEAR) * 3).with(TemporalAdjusters.lastDayOfMonth());
 return Date.from(LastDayOfQuarter.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());
}
</code></pre>

My UnitTests using ZohhakRunner are as follows:

<pre><code>@TestWith({
 "01/03/2000, 31/03/2000",
 "05/04/1982, 30/06/1982",
 "31/05/1982, 30/06/1982",
 "09/07/1990, 30/09/1990",
 "11/11/2019, 31/12/2019",
 "31/03/2016, 31/03/2016"})
public void lastDayOfQuarter_useInputDate_returnExpectedEndOfQuarterDate(String inputDateAsString, String endOfQuarterAsString) throws ParseException{
 Date inputDate = new SimpleDateFormat("dd/MM/yyyy").parse(inputDateAsString);
 Date expectedDate = new SimpleDateFormat("dd/MM/yyyy").parse(endOfQuarterAsString);

 Date result = DateUtils.lastDayOfQuarter(inputDate);
 assertEquals(result, expectedDate);
}
</code></pre>

blocks|key|410835|text|保持简单|type|unstyled|depth|inlineStyleRanges|entityRanges|data|410836|我认为以下内容是最优雅的，因为它没有任何神奇的数字(如92)、TemporalAdjusters或非明显的计算，而且可以很容易地调整到任何季度的开始和结束(不仅仅是当前季度)。|410837|import+static+java.time.temporal.IsoFields.QUARTER_OF_YEAR;

LocalDate+date+=+LocalDate.now();+//+can+be+any+other+date

int+year+=+date.getYear();
int+quarter+=+date.get(QUARTER_OF_YEAR);
++++++++
LocalDate+start+=+YearMonth.of(year,+1)++++++++++++++++++++//+January+of+given+year
+++++++++++++++++++++++++++.with(QUARTER_OF_YEAR,+quarter)+//+becomes+first+month+of+given+quarter
+++++++++++++++++++++++++++.atDay(1);++++++++++++++++++++++//+becomes+first+day+of+given+quarter

LocalDate+end+=+YearMonth.of(year,+3)++++++++++++++++++++++//+March+of+given+year
+++++++++++++++++++++++++.with(QUARTER_OF_YEAR,+quarter)+++//+becomes+3rd+(last)+month+of+given+quarter
+++++++++++++++++++++++++.atEndOfMonth();++++++++++++++++++//+becomes+last+day+of+given+quarter|code-block|syntax|javascript|410838|如果您没有日期，但只有一年和四分之一(例如，Q2+2020)，则如下所示：|410839|LocalDate+start+=+YearMonth.of(2020,+1).with(QUARTER_OF_YEAR,+2).atDay(1);
LocalDate+end+=+YearMonth.of(2020,+3).with(QUARTER_OF_YEAR,+2).atEndOfMonth();|410840|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

<h2>Keep it simple</h2>
I think the following is most elegant because it doesn't have any magical numbers (like 92), TemporalAdjusters or non-obvious calculations, and can easily be adapted to get the start and end of any quarter (not just current quarter).
<pre><code>import static java.time.temporal.IsoFields.QUARTER_OF_YEAR;

LocalDate date = LocalDate.now(); // can be any other date

int year = date.getYear();
int quarter = date.get(QUARTER_OF_YEAR);
 
LocalDate start = YearMonth.of(year, 1) // January of given year
 .with(QUARTER_OF_YEAR, quarter) // becomes first month of given quarter
 .atDay(1); // becomes first day of given quarter

LocalDate end = YearMonth.of(year, 3) // March of given year
 .with(QUARTER_OF_YEAR, quarter) // becomes 3rd (last) month of given quarter
 .atEndOfMonth(); // becomes last day of given quarter
</code></pre>
If you don't have a date, but just a year and quarter (e.g. Q2 2020), this becomes:
<pre><code>LocalDate start = YearMonth.of(2020, 1).with(QUARTER_OF_YEAR, 2).atDay(1);
LocalDate end = YearMonth.of(2020, 3).with(QUARTER_OF_YEAR, 2).atEndOfMonth();
</code></pre>

I need to get the first date of the current quarter as a java.util.Date object and the last date of the current quarter as a java.util.Date object. 

I'm using following methods to get this month first date and this month last date.

<pre><code>private Date getThisMonthFirstDate(){
 Calendar calendar = new GregorianCalendar();
 calendar.set(Calendar.HOUR_OF_DAY, 0);
 calendar.set(Calendar.MINUTE, 0);
 calendar.set(Calendar.SECOND, 0);
 calendar.set(Calendar.MILLISECOND, 0);
 calendar.set(Calendar.DAY_OF_MONTH, 1);
 return calendar.getTime();
}

private Date getThisMonthLastDate(){
 Calendar calandar = new GregorianCalendar();
 calendar.set(Calendar.HOUR_OF_DAY, 0);
 calendar.set(Calendar.MINUTE, 0);
 calendar.set(Calendar.SECOND, 0);
 calendar.set(Calendar.MILLISECOND, 0);
 calendar.set(Calendar.DAY_OF_MONTH,1);
 calendar.add(Calendar.MONTH, 1);
 calendar.add(Calendar.DATE, -1);
 return calendar.getTime();
}
</code></pre>

Is there a way to modify that function to achieve this or could anyone point out a better way?

Assume that Q1 = Jan Feb Mar, Q2 = Apr, May, Jun, etc.

How to get the first date and last date of current quarter in java.util.Date

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我需要将当前季度的第一个日期作为java.util.Date对象，将当前季度的最后一个日期作为java.util.Date对象。我正在使用以下方法来获得这个月的第一次约会和这个月的最后一次约会。private   Date getThisMonthFirstDate(){    Calendar calendar = ...

问如何在java.util.Date中获取当前季度的第一个日期和最后一个日期
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问如何在java.util.Date中获取当前季度的第一个日期和最后一个日期EN