blocks|key|2788203|text|您可以很容易地使用Joda+Time+library来完成这项工作-除了使用标准的Java+Date和Calendar类之外，我还将它用于任何与时间相关的事情。下面是使用该库的示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2788204|MutableDateTime+epoch+=+new+MutableDateTime();
epoch.setDate(0);+//Set+to+Epoch+time
DateTime+now+=+new+DateTime();

Days+days+=+Days.daysBetween(epoch,+now);
Weeks+weeks+=+Weeks.weeksBetween(epoch,+now);
Months+months+=+Months.monthsBetween(epoch,+now);

System.out.println("Days+Since+Epoch:+"+%2B+days.getDays());
System.out.println("Weeks+Since+Epoch:+"+%2B+weeks.getWeeks());
System.out.println("Months+Since+Epoch:+"+%2B+months.getMonths());|code-block|syntax|javascript|2788205|当我运行这个命令时，我得到了以下输出：|2788206|Days+Since+Epoch:+15122
Weeks+Since+Epoch:+2160
Months+Since+Epoch:+496|2788207|entityMap|0|LINK|mutability|MUTABLE|url|http://joda-time.sourceforge.net/index.html^0|9|H|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

You can use the <a href="http://joda-time.sourceforge.net/index.html" rel="noreferrer">Joda Time library</a> to do this pretty easily - I use it for anything time related other than using the standard Java Date and Calendar classes. Take a look at the example below using the library:

<pre><code>MutableDateTime epoch = new MutableDateTime();
epoch.setDate(0); //Set to Epoch time
DateTime now = new DateTime();

Days days = Days.daysBetween(epoch, now);
Weeks weeks = Weeks.weeksBetween(epoch, now);
Months months = Months.monthsBetween(epoch, now);

System.out.println("Days Since Epoch: " + days.getDays());
System.out.println("Weeks Since Epoch: " + weeks.getWeeks());
System.out.println("Months Since Epoch: " + months.getMonths());
</code></pre>

When I run this I get the following output:

<pre><code>Days Since Epoch: 15122
Weeks Since Epoch: 2160
Months Since Epoch: 496
</code></pre>

blocks|key|2502726|text|java.time|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2502727|使用Java8和更高版本中内置的java.time类。|2502728|LocalDate+now+=+LocalDate.now();
LocalDate+epoch+=+LocalDate.ofEpochDay(0);

System.out.println("Days:+"+%2B+ChronoUnit.DAYS.between(epoch,+now));
System.out.println("Weeks:+"+%2B+ChronoUnit.WEEKS.between(epoch,+now));
System.out.println("Months:+"+%2B+ChronoUnit.MONTHS.between(epoch,+now));|code-block|syntax|javascript|2502729|输出|offset|length|style|BOLD|2502730|Days:+16857
Weeks:+2408
Months:+553|2502731|entityMap^0|0|0|0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<h1>java.time</h1>

Use the java.time classes built into Java 8 and later.

<pre><code>LocalDate now = LocalDate.now();
LocalDate epoch = LocalDate.ofEpochDay(0);

System.out.println("Days: " + ChronoUnit.DAYS.between(epoch, now));
System.out.println("Weeks: " + ChronoUnit.WEEKS.between(epoch, now));
System.out.println("Months: " + ChronoUnit.MONTHS.between(epoch, now));
</code></pre>

Output

<pre class="lang-none prettyprint-override"><code>Days: 16857
Weeks: 2408
Months: 553
</code></pre>

blocks|key|2788248|text|我有点惊讶，几乎所有的答案实际上都是计算epoch和now之间的天数。有了java.time.LocalDate，它就像这样简单：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2788249|LocalDate.now().toEpochDay()|code-block|syntax|javascript|2788250|entityMap^0|K|5|Q|3|11|J|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

I'm kind of surprised that almost all answers are actually calculating days between <code>epoch</code> and <code>now</code>. With <code>java.time.LocalDate</code> it's as simple as:

<pre><code>LocalDate.now().toEpochDay()
</code></pre>

blocks|key|885685|text|Long+currentMilli+=+System.currentTimeMillis();
Long+seconds+=+currentMilli+/+1000;
Long+minutes+=+seconds+/+60;
Long+hours+=+minutes+/+60;
Long+days+=+hours+/+24;
System.out.println("Days+since+epoch+:+"++%2B+days);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|885686|或|unstyled|885687|System.out.println("Days+since+epoch+:+"++%2B+((int)+currentMilli+/+86400000));|885688|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>Long currentMilli = System.currentTimeMillis();
Long seconds = currentMilli / 1000;
Long minutes = seconds / 60;
Long hours = minutes / 60;
Long days = hours / 24;
System.out.println("Days since epoch : " + days);
</code></pre>

or

<pre><code>System.out.println("Days since epoch : " + ((int) currentMilli / 86400000));
</code></pre>

blocks|key|885635|text|Calendar+now+=+Calendar.getInstance();
Calendar+cal+=+Calendar.getInstance();
cal.setTimeInMillis(0);+//+start+at+EPOCH

int+days+=+0
while+(cal.getTimeInMillis()+<+now.getTimeInMillis())+{
++days+%2B=+1
++cal.add(Calendar.DAY_OF_MONTH,+1)+//+increment+one+day+at+a+time
}
System.out.println("Days+since+EPOCH+=+"+%2B+days);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|885636|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Calendar now = Calendar.getInstance();
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(0); // start at EPOCH

int days = 0
while (cal.getTimeInMillis() &lt; now.getTimeInMillis()) {
 days += 1
 cal.add(Calendar.DAY_OF_MONTH, 1) // increment one day at a time
}
System.out.println("Days since EPOCH = " + days);
</code></pre>

blocks|key|4577882|text|我不希望有一种优雅的方式来做这件事，因为这不是一个非常普遍的要求。我不禁想知道你为什么要这么做。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4577883|但不管怎样，我的方法是从Calendar中减去纪元日期，然后得到您想要的字段：|offset|length|style|CODE|4577884|Calendar+timeSinceEpoch+=+Calendar.getInstance();
timeSinceEpoch.add(Calendar.YEAR,+-1970);

int+yearsSinceEpoch+=+timeSinceEpoch.get(Calendar.YEAR);
int+monthsSinceEpoch+=+timeSinceEpoch.get(Calendar.MONTH)+%2B+12+*+yearsSinceEpoch;|code-block|syntax|javascript|4577885|entityMap^0|0|C|8|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I wouldn't expect there to be an elegant way of doing it since it is not a very common requirement. I can't help but wonder why you want to do it...

But anyway, the way I would do it is to subtract the epoch date from the <code>Calendar</code> and then get the fields you want:

<pre><code>Calendar timeSinceEpoch = Calendar.getInstance();
timeSinceEpoch.add(Calendar.YEAR, -1970);

int yearsSinceEpoch = timeSinceEpoch.get(Calendar.YEAR);
int monthsSinceEpoch = timeSinceEpoch.get(Calendar.MONTH) + 12 * yearsSinceEpoch;
</code></pre>

blocks|key|2502622|text|Date.getTime()+-返回此Date对象表示的自1970年1月1日00:00:00+GMT以来的毫秒数。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2502623|您可以使用这一点和您关心的间隔中有多少毫秒的知识来进行计算。|2502624|entityMap|0|LINK|mutability|MUTABLE|url|http://download.oracle.com/javase/6/docs/api/java/util/Date.html#getTime%2528%2529^0|0|E|0|E|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

<a href="http://download.oracle.com/javase/6/docs/api/java/util/Date.html#getTime%28%29" rel="nofollow"><code>Date.getTime()</code></a> - Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Date object.

You can use this and knowledge of how many milliseconds are in the intervals you care about to do the calculations.

I'm trying to get the number of days, weeks, months since Epoch in Java. 

The Java Calendar class offers things like calendar.get(GregorianCalendar.DAY_OF_YEAR), or Calendar.get(GregorianCalendar.WEEK_OF_YEAR), which is a good start but it doesn't do exactly what I need.

Is there an elegant way to do this in Java?

Get the number of days, weeks, and months, since Epoch in Java

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我正在尝试获取Java时代以来的天数、周数、月数。Java Calendar类提供了像calendar.get(GregorianCalendar.DAY_OF_YEAR)或Calendar.get(GregorianCalendar.WEEK_OF_YEAR)这样的东西，这是一个很好的开始，但它并不能完全满足我的需求。在Java中有没有一种优雅的方式来实现这一点呢？

问获取自Java中的Epoch以来的天数、周数和月数
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