blocks|key|415837|text|如果您可以使用JodaTime，下面是计算±6个月的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|415838|++++import+org.joda.time.DateTime;
++++import+org.joda.time.Months;
++++....
++++....
++++DateTime+now+=+new+DateTime();
++++DateTime+then+=+new+DateTime().withDate(2011,+8,+1);
++++if(Math.abs(Months.monthsBetween(now,+then).getMonths())+>+6){
++++++++System.out.println("6+mo+apart!");
++++++++//your+logic+goes+here
++++}|code-block|syntax|javascript|415839|entityMap|0|LINK|mutability|MUTABLE|url|http://joda-time.sourceforge.net/api-release/overview-summary.html^0|7|8|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

If you could use <a href="http://joda-time.sourceforge.net/api-release/overview-summary.html" rel="noreferrer">JodaTime</a>, here is code for ±6 months calculation:

<pre><code> import org.joda.time.DateTime;
 import org.joda.time.Months;
 ....
 ....
 DateTime now = new DateTime();
 DateTime then = new DateTime().withDate(2011, 8, 1);
 if(Math.abs(Months.monthsBetween(now, then).getMonths()) &gt; 6){
 System.out.println("6 mo apart!");
 //your logic goes here
 }
</code></pre>

blocks|key|849317|text|我会尝试这个简单的逻辑来完成这项工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|849318|Calendar+cal+=+Calendar.getInstance();++//Get+current+date/month+i.e+27+Feb,+2012
cal.add(Calendar.MONTH,+-6);+++//Go+to+date,+6+months+ago+27+July,+2011
cal.set(Calendar.DAY_OF_MONTH,+1);+//set+date,+to+make+it+1+July,+2011|code-block|syntax|javascript|849319|希望这能有所帮助。|849320|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|$]]

I would try this simple logic to do the job.

<pre><code>Calendar cal = Calendar.getInstance(); //Get current date/month i.e 27 Feb, 2012
cal.add(Calendar.MONTH, -6); //Go to date, 6 months ago 27 July, 2011
cal.set(Calendar.DAY_OF_MONTH, 1); //set date, to make it 1 July, 2011
</code></pre>

Hope this helps.

blocks|key|369983|text|根据您的时间和日期需要使用像尤达-时间这样的库。我想你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|369984|新LocalDate().minusMonths(7).withDayOfMonth(1)|369985|(7个月用于支付任何部分月.留下了一个月前的边缘.但呃:)+)|369986|entityMap|0|LINK|mutability|MUTABLE|url|http://joda-time.sourceforge.net/|1|http://joda-time.sourceforge.net/api-release/org/joda/time/LocalDate.html#LocalDate%2528%2529|2|http://joda-time.sourceforge.net/api-release/org/joda/time/LocalDate.html#minusMonths%2528int%2529|3|http://joda-time.sourceforge.net/api-release/org/joda/time/LocalDate.html#withDayOfMonth%2528int%2529^0|E|5|0|0|0|C|1|D|E|2|S|H|3|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]|$A|13|B|14|1|15]|$A|16|B|17|1|18]]|C|$]]|$1|F|3|G|5|6|7|19|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]|R|$5|K|L|M|C|$N|S]]|T|$5|K|L|M|C|$N|U]]]]

Use a library like <a href="http://joda-time.sourceforge.net/" rel="nofollow">joda-time</a> for your time and date needs. Offhand I think you could do this with: 

<a href="http://joda-time.sourceforge.net/api-release/org/joda/time/LocalDate.html#LocalDate%28%29" rel="nofollow">new LocalDate()</a>.<a href="http://joda-time.sourceforge.net/api-release/org/joda/time/LocalDate.html#minusMonths%28int%29" rel="nofollow">minusMonths(7)</a>.<a href="http://joda-time.sourceforge.net/api-release/org/joda/time/LocalDate.html#withDayOfMonth%28int%29" rel="nofollow">withDayOfMonth(1)</a>

(7 months to cover any partial months... leaves an edge case of the first of the month... but eh :) )

blocks|key|417028|text|YearMonth|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|417029|内置在Java中的java.time.YearMonth类使这个任务变得简单。|417030|今年的月份。这就需要一个时区，因为在任何特定的时刻，全球各地的时区都有不同的日期。在这个月的第一天/最后一天，世界各地的月份都会因地区而异。|417031|YearMonth+ymCurrent+=+YearMonth.now(+ZoneId.of(+"America/Montreal"+)++);|code-block|syntax|javascript|417032|我们知道这个月的定义是不完整的。所以搬到前一个月。|417033|YearMonth+ymPrevious+=+ymCurrent.minusMonths(+1+)+;|417034|如果愿意，提前六个月再行动一次。|417035|YearMonth+ymSixMonthsMore+=+ymPrevious.minusMonths(+6+);|417036|YearMonth对象本身在代码中可能很有用。您可以在代码周围记录这个类的这些对象。|417037|如果你需要一个月的第一天，问一问。|417038|LocalDate+ld+=+ymSixMonthsMore.atDay(+1+);|417039|entityMap^0|0|9|0|9|J|0|0|0|0|0|0|0|0|9|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1A|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1B|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1C|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|1D|8|@]|D|@]|E|$M|N]]|$1|S|3|T|5|6|7|1E|8|@]|D|@]|E|$]]|$1|U|3|V|5|L|7|1F|8|@]|D|@]|E|$M|N]]|$1|W|3|X|5|6|7|1G|8|@$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|Y|3|Z|5|6|7|1J|8|@]|D|@]|E|$]]|$1|10|3|11|5|L|7|1K|8|@]|D|@]|E|$M|N]]|$1|12|3|-4|5|6|7|1L|8|@]|D|@]|E|$]]]|13|$]]

<h1><code>YearMonth</code></h1>

The <code>java.time.YearMonth</code> class built into Java makes this task simple.

Get the current year-month. This requires a time zone as at any given moment the date varies around the globe by zone. On the first/last day of the month, the month can vary around the world by zone.

<pre><code>YearMonth ymCurrent = YearMonth.now( ZoneId.of( "America/Montreal" ) );
</code></pre>

We know the current month is incomplete by definition. So move to the previous month. 

<pre><code>YearMonth ymPrevious = ymCurrent.minusMonths( 1 ) ;
</code></pre>

Move a further six months earlier if desired.

<pre><code>YearMonth ymSixMonthsMore = ymPrevious.minusMonths( 6 );
</code></pre>

That <code>YearMonth</code> object itself may be useful in your code. You can pas these objects of this class around your code. 

If you need the first day of a month, ask.

<pre><code>LocalDate ld = ymSixMonthsMore.atDay( 1 );
</code></pre>

blocks|key|370004|text|据我所知，您需要有一个实用程序，它将确定是否在将要设置的引用日期之前6个月为可变日期。看看我针对这个问题的代码片段。它只需要使用java.util.Calendar，您就不必使用其他库。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|370005|import+java.util.Calendar;

public+class+Test
{
++++public+static+void+main(String[]+args)
++++{
++++++++Calendar+cal1+=+Calendar.getInstance();
++++++++cal1.set(2012,+2,+27);
++++++++Calendar+cal2+=+Calendar.getInstance();
++++++++cal2.set(2011,+8,+1);
++++++++boolean+valid+=+isSixMonthsAgo(cal1,+cal2);
++++++++System.out.println(valid);
++++}

++++public+static+boolean+isSixMonthsAgo(Calendar+referenceDate,+Calendar+dateToBeTested)+
++++{
++++++++int+year1+=+referenceDate.get(Calendar.YEAR);
++++++++int+month1+=+referenceDate.get(Calendar.MONTH);

++++++++int+year2+=+dateToBeTested.get(Calendar.YEAR);
++++++++int+month2+=+dateToBeTested.get(Calendar.MONTH);

++++++++if+((year1+*+12+%2B+month1)+-+(year2+*+12+%2B+month2)+>+6)
++++++++++++return+true;
++++++++return+false;
++++}
}|code-block|syntax|javascript|370006|entityMap^0|K|C|1S|I|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|S|8|@]|E|@]|F|$J|K]]|$1|L|3|-4|5|6|7|T|8|@]|E|@]|F|$]]]|M|$]]

As I understand, you need to have a utility which will determine whether a variable date is 6 months before the reference date that you will set. Take a look at my code snippet for this problem. It just gets use of <code>java.util.Calendar</code>, you don't have to use some other libraries.

<pre><code>import java.util.Calendar;

public class Test
{
 public static void main(String[] args)
 {
 Calendar cal1 = Calendar.getInstance();
 cal1.set(2012, 2, 27);
 Calendar cal2 = Calendar.getInstance();
 cal2.set(2011, 8, 1);
 boolean valid = isSixMonthsAgo(cal1, cal2);
 System.out.println(valid);
 }

 public static boolean isSixMonthsAgo(Calendar referenceDate, Calendar dateToBeTested) 
 {
 int year1 = referenceDate.get(Calendar.YEAR);
 int month1 = referenceDate.get(Calendar.MONTH);

 int year2 = dateToBeTested.get(Calendar.YEAR);
 int month2 = dateToBeTested.get(Calendar.MONTH);

 if ((year1 * 12 + month1) - (year2 * 12 + month2) &gt; 6)
 return true;
 return false;
 }
}
</code></pre>

I need to identify the date which is 6 complete months ago. For example:

<pre class="lang-none prettyprint-override"><code>Feb-27, 2012(Today) - It is Feb and we don't count incomplete month, false
Feb-01, 2012 - Still Feb so don't count too, false
Jan-01, 2011 - Completed, false
Dec-01, 2011 - Completed, false
Nov-01, 2011 - Completed, false
Oct-01, 2011 - Completed, false
Sep-01, 2011 - Completed, false
Aug-01, 2011 - Completed, false
Jul-01, 2011 - Already pass 6 complete months, true
</code></pre>

It should work in whatever date in the future.

I thought of current date minus 30*6=180 days, but it is not accurate. 

It needs to be accurate because, for example, if we identify Jul 2011 is valid then we will housekeep all the data for that month.

Thanks.

How to identify date of 6 complete months ago

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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我需要确定六个月前的日期。例如：Feb-27, 2012(Today) - It is Feb and we don't count incomplete month, falseFeb-01, 2012 - Still Feb so don't count too, falseJan-01, 2011 - Completed, falseDec-01, 2011 - Completed, fal

问如何识别6个月前的日期
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