blocks|key|1237760|text|使用DateTime::add。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1237761|$start+=+new+DateTime("2010-12-11",+new+DateTimeZone("UTC"));
$month_later+=+clone+$start;
$month_later->add(new+DateInterval("P1M"));|code-block|syntax|javascript|1237762|我使用clone是因为add修改了原始对象，这可能并不是我们想要的。|1237763|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/datetime.add.php|1|http://php.net/manual/en/language.oop5.cloning.php^0|2|D|2|D|0|0|0|3|5|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@]|D|@$9|14|A|15|1|16]]|E|$]]|$1|M|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]]]

Use <a href="http://www.php.net/manual/en/datetime.add.php" rel="noreferrer"><code>DateTime::add</code></a>.

<pre><code>$start = new DateTime("2010-12-11", new DateTimeZone("UTC"));
$month_later = clone $start;
$month_later-&gt;add(new DateInterval("P1M"));
</code></pre>

I used <a href="http://php.net/manual/en/language.oop5.cloning.php" rel="noreferrer">clone</a> because add modifies the original object, which might not be desired.

blocks|key|1943478|text|strtotime(+"%2B1+month",+strtotime(+$time+)+);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1943479|这将返回可与date函数一起使用的时间戳|unstyled|1943480|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>strtotime( "+1 month", strtotime( $time ) );
</code></pre>

this returns a timestamp that can be used with the date function

blocks|key|3351571|text|$time+=+strtotime("2010.12.11");
$final+=+date("Y-m-d",+strtotime("%2B1+month",+$time));

//+Finally+you+will+have+the+date+you're+looking+for.|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3351572|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>$time = strtotime("2010.12.11");
$final = date("Y-m-d", strtotime("+1 month", $time));

// Finally you will have the date you're looking for.
</code></pre>

blocks|key|3351591|text|我需要类似的功能，除了一个月的周期(加月减1天)。在搜索S.O.一段时间后，我能够创建这个即插即用解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3351592|function+add_months($months,+DateTime+$dateObject)+
++++{
++++++++$next+=+new+DateTime($dateObject->format('Y-m-d'));
++++++++$next->modify('last+day+of+%2B'.$months.'+month');

++++++++if($dateObject->format('d')+>+$next->format('d'))+{
++++++++++++return+$dateObject->diff($next);
++++++++}+else+{
++++++++++++return+new+DateInterval('P'.$months.'M');
++++++++}
++++}

function+endCycle($d1,+$months)
++++{
++++++++$date+=+new+DateTime($d1);

++++++++//+call+second+function+to+add+the+months
++++++++$newDate+=+$date->add(add_months($months,+$date));

++++++++//+goes+back+1+day+from+date,+remove+if+you+want+same+day+of+month
++++++++$newDate->sub(new+DateInterval('P1D'));+

++++++++//formats+final+date+to+Y-m-d+form
++++++++$dateReturned+=+$newDate->format('Y-m-d');+

++++++++return+$dateReturned;
++++}|code-block|syntax|javascript|3351593|示例：|3351594|$startDate+=+'2014-06-03';+//+select+date+in+Y-m-d+format
$nMonths+=+1;+//+choose+how+many+months+you+want+to+move+ahead
$final+=+endCycle($startDate,+$nMonths);+//+output:+2014-07-02|3351595|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I needed similar functionality, except for a monthly cycle (plus months, minus 1 day). After searching S.O. for a while, I was able to craft this plug-n-play solution:

<pre><code>function add_months($months, DateTime $dateObject) 
 {
 $next = new DateTime($dateObject-&gt;format('Y-m-d'));
 $next-&gt;modify('last day of +'.$months.' month');

 if($dateObject-&gt;format('d') &gt; $next-&gt;format('d')) {
 return $dateObject-&gt;diff($next);
 } else {
 return new DateInterval('P'.$months.'M');
 }
 }

function endCycle($d1, $months)
 {
 $date = new DateTime($d1);

 // call second function to add the months
 $newDate = $date-&gt;add(add_months($months, $date));

 // goes back 1 day from date, remove if you want same day of month
 $newDate-&gt;sub(new DateInterval('P1D')); 

 //formats final date to Y-m-d form
 $dateReturned = $newDate-&gt;format('Y-m-d'); 

 return $dateReturned;
 }
</code></pre>

Example: 

<pre><code>$startDate = '2014-06-03'; // select date in Y-m-d format
$nMonths = 1; // choose how many months you want to move ahead
$final = endCycle($startDate, $nMonths); // output: 2014-07-02
</code></pre>

blocks|key|491031|text|(date('d')+>+28)+?+date("mdY",+strtotime("last+day+of+next+month"))+:+date("mdY",+strtotime("%2B1+month"));|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|491032|这将补偿2月份和其他31天的月份。当然，你可以做更多的检查，以获得更准确的“下个月的今天”relative+date+formats+(遗憾的是，它不能工作，见下文)，你也可以使用DateTime。|unstyled|offset|length|491033|DateInterval('P1M')和strtotime("%2B1+month")本质上都是盲目地添加31天，而不考虑下个月的天数。|style|CODE|491034|491035|2010-01-31+=>+3月3日|unordered-list-item|491036|2012-01-31+=>+3月2日(闰年)|491037|491038|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/datetime.formats.relative.php^0|0|19|L|0|0|0|J|K|L|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|12|8|@]|9|@$G|13|H|14|1|15]]|A|$]]|$1|I|3|J|5|F|7|16|8|@$G|17|H|18|K|L]|$G|19|H|1A|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|F|7|1B|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1C|8|@]|9|@]|A|$]]|$1|Q|3|R|5|P|7|1D|8|@]|9|@]|A|$]]|$1|S|3|-4|5|F|7|1E|8|@]|9|@]|A|$]]|$1|T|3|-4|5|F|7|1F|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]]]

<pre><code>(date('d') &gt; 28) ? date("mdY", strtotime("last day of next month")) : date("mdY", strtotime("+1 month"));
</code></pre>

This will compensate for February and the other 31 day months. You could of course do a lot more checking to to get more exact for 'this day next month' <a href="http://php.net/manual/en/datetime.formats.relative.php" rel="noreferrer">relative date formats</a> (which does not work sadly, see below), and you could just as well use DateTime.

Both <code>DateInterval('P1M')</code> and <code>strtotime("+1 month")</code> are essentially blindly adding 31 days regardless of the number of days in the following month.

<ul>
<li>2010-01-31 => March 3rd</li>
<li>2012-01-31 => March 2nd (leap year)</li>
</ul>

blocks|key|1943609|text|我是这样用的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1943610|+$occDate='2014-01-28';
+$forOdNextMonth=+date('m',+strtotime("%2B1+month",+strtotime($occDate)));
//Output:-+$forOdNextMonth=02


/*****************more+example****************/
$occDate='2014-12-28';

$forOdNextMonth=+date('m',+strtotime("%2B1+month",+strtotime($occDate)));
//Output:-+$forOdNextMonth=01

//***********************wrong+way**********************************//
$forOdNextMonth=+date('m',+strtotime("%2B1+month",+$occDate));
++//Output:-+$forOdNextMonth=02;+//instead+of+$forOdNextMonth=01;
//******************************************************************//|code-block|syntax|javascript|1943611|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|$]]

I use this way:- 

<pre><code> $occDate='2014-01-28';
 $forOdNextMonth= date('m', strtotime("+1 month", strtotime($occDate)));
//Output:- $forOdNextMonth=02


/*****************more example****************/
$occDate='2014-12-28';

$forOdNextMonth= date('m', strtotime("+1 month", strtotime($occDate)));
//Output:- $forOdNextMonth=01

//***********************wrong way**********************************//
$forOdNextMonth= date('m', strtotime("+1 month", $occDate));
 //Output:- $forOdNextMonth=02; //instead of $forOdNextMonth=01;
//******************************************************************//
</code></pre>

blocks|key|3351715|text|谢谢Jason，你的帖子非常有帮助。我重新格式化了它，并添加了更多的注释来帮助我理解它。如果这对任何人都有帮助，我在这里发布了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3351716|function+cycle_end_date($cycle_start_date,+$months)+{
++++$cycle_start_date_object+=+new+DateTime($cycle_start_date);

++++//Find+the+date+interval+that+we+will+need+to+add+to+the+start+date
++++$date_interval+=+find_date_interval($months,+$cycle_start_date_object);

++++//Add+this+date+interval+to+the+current+date+(the+DateTime+class+handles+remaining+complexity+like+year-ends)
++++$cycle_end_date_object+=+$cycle_start_date_object->add($date_interval);

++++//Subtract+(sub)+1+day+from+date
++++$cycle_end_date_object->sub(new+DateInterval('P1D'));+

++++//Format+final+date+to+Y-m-d
++++$cycle_end_date+=+$cycle_end_date_object->format('Y-m-d');+

++++return+$cycle_end_date;
}

//Find+the+date+interval+we+need+to+add+to+start+date+to+get+end+date
function+find_date_interval($n_months,+DateTime+$cycle_start_date_object)+{
++++//Create+new+datetime+object+identical+to+inputted+one
++++$date_of_last_day_next_month+=+new+DateTime($cycle_start_date_object->format('Y-m-d'));

++++//And+modify+it+so+it+is+the+date+of+the+last+day+of+the+next+month
++++$date_of_last_day_next_month->modify('last+day+of+%2B'.$n_months.'+month');

++++//If+the+day+of+inputted+date+(e.g.+31)+is+greater+than+last+day+of+next+month+(e.g.+28)
++++if($cycle_start_date_object->format('d')+>+$date_of_last_day_next_month->format('d'))+{
++++++++//Return+a+DateInterval+object+equal+to+the+number+of+days+difference
++++++++return+$cycle_start_date_object->diff($date_of_last_day_next_month);
++++//Otherwise+the+date+is+easy+and+we+can+just+add+a+month+to+it
++++}+else+{
++++++++//Return+a+DateInterval+object+equal+to+a+period+(P)+of+1+month+(M)
++++++++return+new+DateInterval('P'.$n_months.'M');
++++}
}

$cycle_start_date+=+'2014-01-31';+//+select+date+in+Y-m-d+format
$n_months+=+1;+//+choose+how+many+months+you+want+to+move+ahead
$cycle_end_date+=+cycle_end_date($cycle_start_date,+$n_months);+//+output:+2014-07-02|code-block|syntax|javascript|3351717|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|$]]

Thanks Jason, your post was very helpful. I reformatted it and added more comments to help me understand it all. In case that helps anyone, I have posted it here: 

<pre><code>function cycle_end_date($cycle_start_date, $months) {
 $cycle_start_date_object = new DateTime($cycle_start_date);

 //Find the date interval that we will need to add to the start date
 $date_interval = find_date_interval($months, $cycle_start_date_object);

 //Add this date interval to the current date (the DateTime class handles remaining complexity like year-ends)
 $cycle_end_date_object = $cycle_start_date_object-&gt;add($date_interval);

 //Subtract (sub) 1 day from date
 $cycle_end_date_object-&gt;sub(new DateInterval('P1D')); 

 //Format final date to Y-m-d
 $cycle_end_date = $cycle_end_date_object-&gt;format('Y-m-d'); 

 return $cycle_end_date;
}

//Find the date interval we need to add to start date to get end date
function find_date_interval($n_months, DateTime $cycle_start_date_object) {
 //Create new datetime object identical to inputted one
 $date_of_last_day_next_month = new DateTime($cycle_start_date_object-&gt;format('Y-m-d'));

 //And modify it so it is the date of the last day of the next month
 $date_of_last_day_next_month-&gt;modify('last day of +'.$n_months.' month');

 //If the day of inputted date (e.g. 31) is greater than last day of next month (e.g. 28)
 if($cycle_start_date_object-&gt;format('d') &gt; $date_of_last_day_next_month-&gt;format('d')) {
 //Return a DateInterval object equal to the number of days difference
 return $cycle_start_date_object-&gt;diff($date_of_last_day_next_month);
 //Otherwise the date is easy and we can just add a month to it
 } else {
 //Return a DateInterval object equal to a period (P) of 1 month (M)
 return new DateInterval('P'.$n_months.'M');
 }
}

$cycle_start_date = '2014-01-31'; // select date in Y-m-d format
$n_months = 1; // choose how many months you want to move ahead
$cycle_end_date = cycle_end_date($cycle_start_date, $n_months); // output: 2014-07-02
</code></pre>

blocks|key|1237892|text|请先将您的日期格式设置为12-12-2012|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1237893|使用此函数后，它可以正常工作；|1237894|$date+=++date('d-m-Y',strtotime("12-12-2012+%2B2+Months");|code-block|syntax|javascript|1237895|这里12-12-2012是您的日期，%2B2个月是该月的增量；|1237896|您还可以递增年份、日期|1237897|strtotime("12-12-2012+%2B1+Year");|1237898|Ans是12-12-2013|1237899|entityMap^0|0|0|0|0|0|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]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|X|8|@]|9|@]|A|$G|H]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Please first you set your date format as like 12-12-2012

After use this function it's work properly;

<pre><code>$date = date('d-m-Y',strtotime("12-12-2012 +2 Months");
</code></pre>

Here 12-12-2012 is your date and +2 Months is increment of the month;

You also increment of Year, Date 

<pre><code>strtotime("12-12-2012 +1 Year");
</code></pre>

Ans is 12-12-2013

blocks|key|1234913|text|function+dayOfWeek($date){
++++return+DateTime::createFromFormat('Y-m-d',+$date)->format('N');
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1234914|使用示例：|unstyled|1234915|echo+dayOfWeek(2016-12-22);
//+"4"
echo+dayOfWeek(date('Y-m-d'));
//+"4"|1234916|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>function dayOfWeek($date){
 return DateTime::createFromFormat('Y-m-d', $date)-&gt;format('N');
}
</code></pre>

Usage examples:

<pre><code>echo dayOfWeek(2016-12-22);
// "4"
echo dayOfWeek(date('Y-m-d'));
// "4"
</code></pre>

blocks|key|491114|text|$date+=+strtotime("2017-12-11");
$newDate+=+date("Y-m-d",+strtotime("%2B1+month",+$date));|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|491115|如果你想按天递增，你也可以这样做。|unstyled|491116|$date+=+strtotime("2017-12-11");
$newDate+=+date("Y-m-d",+strtotime("%2B5+day",+$date));|491117|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>$date = strtotime("2017-12-11");
$newDate = date("Y-m-d", strtotime("+1 month", $date));
</code></pre>

If you want to increment by days you can also do it

<pre><code>$date = strtotime("2017-12-11");
$newDate = date("Y-m-d", strtotime("+5 day", $date));
</code></pre>

blocks|key|1943850|text|为任何人寻找任何日期格式的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1943851|echo+date_create_from_format('d/m/Y',+'15/04/2017')->add(new+DateInterval('P1M'))->format('d/m/Y');|code-block|syntax|javascript|1943852|只需更改日期格式即可。|1943853|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|$]]

For anyone looking for an answer to any date format.

<pre><code>echo date_create_from_format('d/m/Y', '15/04/2017')-&gt;add(new DateInterval('P1M'))-&gt;format('d/m/Y');
</code></pre>

Just change the date format.

blocks|key|3351900|text|您可以像这样使用DateTime::modify：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3351901|$date+=+new+DateTime('2010-12-11');
$date->modify('%2B1+month');|code-block|syntax|javascript|3351902|请参阅文档：|3351903|http://php.net/manual/fr/datetime.modify.php|3351904|http://php.net/manual/fr/class.datetime.php|3351905|3351906|2021年1月更新:更正comments提出的错误|BOLD|3351907|这个解决方案有几个月的问题，只有31天，比如五月等等。|3351908|例如:这是从5月31日跳到7月1日，这是不正确的。|3351909|要纠正这一点，您可以创建此自定义函数|3351910|function+addMonths($date,$months){
++++
++++$init=clone+$date;
++++$modifier=$months.'+months';
++++$back_modifier+=-$months.'+months';
+++
++++$date->modify($modifier);
++++$back_to_init=+clone+$date;
++++$back_to_init->modify($back_modifier);
+++
++++while($init->format('m')!=$back_to_init->format('m')){
++++++++$date->modify('-1+day')++++;
++++++++$back_to_init=+clone+$date;
++++++++$back_to_init->modify($back_modifier);+++
++++}
}|3351911|然后你可以像这样使用它：|3351912|$date+=+new+DateTime('2010-05-31');
addMonths($date,+1);
print_r($date);
//DateTime+Object+(+[date]+=>+2010-06-30+00:00:00.000000+[timezone_type]+=>+3+[timezone]+=>+Europe/Berlin+)+|3351913|这个解决方案可以在jenspj：https://www.php.net/manual/fr/datetime.modify.php#107592发布的PHP.net中找到|3351914|entityMap|0|LINK|mutability|MUTABLE|url|1|2|https://www.php.net/manual/fr/datetime.modify.php#107592^0|8|G|0|0|0|0|18|0|0|0|17|1|0|0|7|D|0|0|0|0|0|0|0|G|1K|2|0^^$0|@$1|2|3|4|5|6|7|1I|8|@$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1L|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1M|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1N|8|@]|D|@$9|1O|A|1P|1|1Q]]|E|$]]|$1|O|3|P|5|6|7|1R|8|@]|D|@$9|1S|A|1T|1|1U]]|E|$]]|$1|Q|3|-4|5|6|7|1V|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|1W|8|@$9|1X|A|1Y|B|T]]|D|@]|E|$]]|$1|U|3|V|5|6|7|1Z|8|@]|D|@]|E|$]]|$1|W|3|X|5|6|7|20|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|6|7|21|8|@]|D|@]|E|$]]|$1|10|3|11|5|H|7|22|8|@]|D|@]|E|$I|J]]|$1|12|3|13|5|6|7|23|8|@]|D|@]|E|$]]|$1|14|3|15|5|H|7|24|8|@]|D|@]|E|$I|J]]|$1|16|3|17|5|6|7|25|8|@]|D|@$9|26|A|27|1|28]]|E|$]]|$1|18|3|-4|5|6|7|29|8|@]|D|@]|E|$]]]|19|$1A|$5|1B|1C|1D|E|$1E|N]]|1F|$5|1B|1C|1D|E|$1E|P]]|1G|$5|1B|1C|1D|E|$1E|1H]]]]

You can use <code>DateTime::modify</code> like this :
<pre><code>$date = new DateTime('2010-12-11');
$date-&gt;modify('+1 month');
</code></pre>
See documentations :
<a href="http://php.net/manual/fr/datetime.modify.php" rel="nofollow noreferrer">http://php.net/manual/fr/datetime.modify.php</a>
<a href="http://php.net/manual/fr/class.datetime.php" rel="nofollow noreferrer">http://php.net/manual/fr/class.datetime.php</a>
<hr />
UPDATE january 2021 : correct mistakes raised by comments
This solution has some problems for months with 31 days like May etc.
Exemple : this jumps from 31st May to 1st July which is incorrect.
To correct that, you can create this custom function
<pre><code>function addMonths($date,$months){
 
 $init=clone $date;
 $modifier=$months.' months';
 $back_modifier =-$months.' months';
 
 $date-&gt;modify($modifier);
 $back_to_init= clone $date;
 $back_to_init-&gt;modify($back_modifier);
 
 while($init-&gt;format('m')!=$back_to_init-&gt;format('m')){
 $date-&gt;modify('-1 day') ;
 $back_to_init= clone $date;
 $back_to_init-&gt;modify($back_modifier); 
 }
}
</code></pre>
Then you can use it like that :
<pre><code>$date = new DateTime('2010-05-31');
addMonths($date, 1);
print_r($date);
//DateTime Object ( [date] =&gt; 2010-06-30 00:00:00.000000 [timezone_type] =&gt; 3 [timezone] =&gt; Europe/Berlin ) 
</code></pre>
This solution was found in PHP.net posted by jenspj : <a href="https://www.php.net/manual/fr/datetime.modify.php#107592" rel="nofollow noreferrer">https://www.php.net/manual/fr/datetime.modify.php#107592</a>

blocks|key|489708|text|在输入框中输入日期，然后单击按钮get+day+from+date+in+jquery|type|unstyled|depth|inlineStyleRanges|entityRanges|data|489709|$(document).ready(+function()+{
++++$("button").click(function(){+++
++++var+day+=+["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];
++++var+a+=+new+Date();
++++$(".result").text(day[a.getDay()]);

++++});++
+++++++++++++});|code-block|syntax|javascript|489710|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|$]]

put a date in input box then click the button get day from date in jquery

<pre><code>$(document).ready( function() {
 $("button").click(function(){ 
 var day = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];
 var a = new Date();
 $(".result").text(day[a.getDay()]);

 }); 
 });
</code></pre>

blocks|key|3351977|text|+<?php
++++++++++++++$selectdata+="select+fromd,tod++from+register+where+username='$username'";
++++++++++++$q=mysqli_query($conm,$selectdata);
++++++++++++$row=mysqli_fetch_array($q);

++++++++++++$startdate=$row['fromd'];+
++++++++++++$stdate=date('Y',+strtotime($startdate));++

++++++++++++$endate=$row['tod'];+
++++++++++++$enddate=date('Y',+strtotime($endate));++

++++++++++++$years+=+range+($stdate,$enddate);
++++++++++++echo+'<select+name="years"+class="form-control">';
++++++++++++echo+'<option>SELECT</option>';
++++++++++++foreach($years+as+$year)
++++++++++++++{+++echo+'<option+value="'.$year.'">+'.$year.'+</option>';++}
++++++++++++++++echo+'</select>';+?>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3351978|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> &lt;?php
 $selectdata ="select fromd,tod from register where username='$username'";
 $q=mysqli_query($conm,$selectdata);
 $row=mysqli_fetch_array($q);

 $startdate=$row['fromd']; 
 $stdate=date('Y', strtotime($startdate)); 

 $endate=$row['tod']; 
 $enddate=date('Y', strtotime($endate)); 

 $years = range ($stdate,$enddate);
 echo '&lt;select name="years" class="form-control"&gt;';
 echo '&lt;option&gt;SELECT&lt;/option&gt;';
 foreach($years as $year)
 { echo '&lt;option value="'.$year.'"&gt; '.$year.' &lt;/option&gt;'; }
 echo '&lt;/select&gt;'; ?&gt;
</code></pre>

blocks|key|1238008|text|所有提供的解决方案都不能正常工作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1238009|strtotime()和DateTime::add或DateTime::modify有时会给出无效结果。|1238010|示例：|1238011|1238012|31.08.2019+%2B1个月给出01.10.2019而30.09.2019|unordered-list-item|1238013|29.02.2020+%2B1年给出01.03.2021而不是28.02.2021|1238014|1238015|(在PHP5.5、PHP7.3上测试)|1238016|下面是我的基于idea+posted+by+Angelo的函数，可以解决这个问题：|1238017|//+$time+-+unix+time+or+date+in+any+format+accepted+by+strtotime()+e.g.+2020-02-29++
//+$days,+$months,+$years+-+values+to+add
//+returns+new+date+in+format+2021-02-28
function+addTime($time,+$days,+$months,+$years)
{
++++//+Convert+unix+time+to+date+format
++++if+(is_numeric($time))
++++$time+=+date('Y-m-d',+$time);

++++try
++++{
++++++++$date_time+=+new+DateTime($time);
++++}
++++catch+(Exception+$e)
++++{
++++++++echo+$e->getMessage();
++++++++exit;
++++}

++++if+($days)
++++$date_time->add(new+DateInterval('P'.$days.'D'));

++++//+Preserve+day+number
++++if+($months+or+$years)
++++$old_day+=+$date_time->format('d');

++++if+($months)
++++$date_time->add(new+DateInterval('P'.$months.'M'));

++++if+($years)
++++$date_time->add(new+DateInterval('P'.$years.'Y'));

++++//+Patch+for+adding+months+or+years++++
++++if+($months+or+$years)
++++{
++++++++$new_day+=+$date_time->format("d");

++++++++//+The+day+is+changed+-+set+the+last+day+of+the+previous+month
++++++++if+($old_day+!=+$new_day)
++++++++$date_time->sub(new+DateInterval('P'.$new_day.'D'));
++++}
++++//+You+can+chage+returned+format+here
++++return+$date_time->format('Y-m-d');
}|code-block|syntax|javascript|1238018|使用示例：|1238019|echo+addTime('2020-02-29',+0,+0,+1);+//+add+1+year+(result:+2021-02-28)
echo+addTime('2019-08-31',+0,+1,+0);+//+add+1+month+(result:+2019-09-30)
echo+addTime('2019-03-15',+12,+2,+1);+//+add+12+days,+2+months,+1+year+(result:+2019-09-30)|1238020|entityMap|0|LINK|mutability|MUTABLE|url|https://www.php.net/manual/en/datetime.add.php|1|https://www.php.net/manual/en/datetime.modify.php|2|https://www.php.net/manual/en/datetime.add.php#118342^0|9|8|0|C|D|0|Q|G|1|0|0|0|0|0|0|0|7|L|2|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1F|8|@$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1I|8|@]|D|@$9|1J|A|1K|1|1L]|$9|1M|A|1N|1|1O]]|E|$]]|$1|H|3|I|5|6|7|1P|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|K|3|L|5|M|7|1R|8|@]|D|@]|E|$]]|$1|N|3|O|5|M|7|1S|8|@]|D|@]|E|$]]|$1|P|3|-4|5|6|7|1T|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1U|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|1V|8|@]|D|@$9|1W|A|1X|1|1Y]]|E|$]]|$1|U|3|V|5|W|7|1Z|8|@]|D|@]|E|$X|Y]]|$1|Z|3|10|5|6|7|20|8|@]|D|@]|E|$]]|$1|11|3|12|5|W|7|21|8|@]|D|@]|E|$X|Y]]|$1|13|3|-4|5|6|7|22|8|@]|D|@]|E|$]]]|14|$15|$5|16|17|18|E|$19|1A]]|1B|$5|16|17|18|E|$19|1C]]|1D|$5|16|17|18|E|$19|1E]]]]

All presented solutions are not working properly. 
strtotime() and <a href="https://www.php.net/manual/en/datetime.add.php" rel="nofollow noreferrer">DateTime::add</a> or <a href="https://www.php.net/manual/en/datetime.modify.php" rel="nofollow noreferrer">DateTime::modify</a> give sometime invalid results. 
Examples: 
- 31.08.2019 + 1 month gives 01.10.2019 instead 30.09.2019 
- 29.02.2020 + 1 year gives 01.03.2021 instead 28.02.2021 
(tested on PHP 5.5, PHP 7.3)

Below is my function based on <a href="https://www.php.net/manual/en/datetime.add.php#118342" rel="nofollow noreferrer">idea posted by Angelo</a> that solves the problem:

<pre><code>// $time - unix time or date in any format accepted by strtotime() e.g. 2020-02-29 
// $days, $months, $years - values to add
// returns new date in format 2021-02-28
function addTime($time, $days, $months, $years)
{
 // Convert unix time to date format
 if (is_numeric($time))
 $time = date('Y-m-d', $time);

 try
 {
 $date_time = new DateTime($time);
 }
 catch (Exception $e)
 {
 echo $e-&gt;getMessage();
 exit;
 }

 if ($days)
 $date_time-&gt;add(new DateInterval('P'.$days.'D'));

 // Preserve day number
 if ($months or $years)
 $old_day = $date_time-&gt;format('d');

 if ($months)
 $date_time-&gt;add(new DateInterval('P'.$months.'M'));

 if ($years)
 $date_time-&gt;add(new DateInterval('P'.$years.'Y'));

 // Patch for adding months or years 
 if ($months or $years)
 {
 $new_day = $date_time-&gt;format("d");

 // The day is changed - set the last day of the previous month
 if ($old_day != $new_day)
 $date_time-&gt;sub(new DateInterval('P'.$new_day.'D'));
 }
 // You can chage returned format here
 return $date_time-&gt;format('Y-m-d');
}
</code></pre>

Usage examples: 

<pre><code>echo addTime('2020-02-29', 0, 0, 1); // add 1 year (result: 2021-02-28)
echo addTime('2019-08-31', 0, 1, 0); // add 1 month (result: 2019-09-30)
echo addTime('2019-03-15', 12, 2, 1); // add 12 days, 2 months, 1 year (result: 2019-09-30)
</code></pre>

blocks|key|489747|text|只需更新答案与简单的方法寻找日期后，没有月份。因为最好的答案并不能给出正确的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|489748|<?php

++++$date+=+date('2020-05-31');
++++$current+=+date("m",strtotime($date));
++++$next+=+date("m",strtotime($date."%2B1+month"));
++++if($current==$next-1){
++++++++$needed+=+date('Y-m-d',strtotime($date."+%2B1+month"));
++++}else{
++++++++$needed+=+date('Y-m-d',+strtotime("last+day+of+next+month",strtotime($date)));
++++}
++++echo+"Date+after+1+month+from+2020-05-31+would+be+:+$needed";

?>|code-block|syntax|javascript|489749|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|$]]

Just updating the answer with simple method for find the date after no of months. As the best answer marked doesn't give the correct solution.

<pre><code>&lt;?php

 $date = date('2020-05-31');
 $current = date("m",strtotime($date));
 $next = date("m",strtotime($date."+1 month"));
 if($current==$next-1){
 $needed = date('Y-m-d',strtotime($date." +1 month"));
 }else{
 $needed = date('Y-m-d', strtotime("last day of next month",strtotime($date)));
 }
 echo "Date after 1 month from 2020-05-31 would be : $needed";

?&gt;
</code></pre>

blocks|key|1235040|text|如果你想得到一个月后的日期，你可以这样做|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1235041|echo+date('Y-m-d',+strtotime('1+month'));|code-block|syntax|javascript|1235042|如果你想得到两个月后的日期，你可以这样做|1235043|echo+date('Y-m-d',+strtotime('2+month'));|1235044|以此类推，仅此而已。|1235045|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If you want to get the date of one month from now you can do it like this
<pre><code>echo date('Y-m-d', strtotime('1 month'));
</code></pre>
If you want to get the date of two months from now, you can achieve that by doing this
<pre><code>echo date('Y-m-d', strtotime('2 month'));
</code></pre>
And so on, that's all.

blocks|key|1238050|text|//ECHO+MONTHS+BETWEEN+TWO+TIMESTAMPS
$my_earliest_timestamp+=+1532095200;
$my_latest_timestamp+=+1554991200;

echo+'<pre>';
echo+"Earliest+timestamp:+".+date('c',$my_earliest_timestamp)+."\r\n";
echo+"Latest+timestamp:+"+.date('c',$my_latest_timestamp)+."\r\n\r\n";

echo+"Month+start+of+earliest+timestamp:+".+date('c',strtotime('first+day+of+'.+date('F+Y',$my_earliest_timestamp)))+."\r\n";
echo+"Month+start+of+latest+timestamp:+"+.date('c',strtotime('first+day+of+'.+date('F+Y',$my_latest_timestamp)))+."\r\n\r\n";

echo+"Month+end+of+earliest+timestamp:+".+date('c',strtotime('last+day+of+'.+date('F+Y',$my_earliest_timestamp))+%2B+86399)+."\r\n";
echo+"Month+end+of+latest+timestamp:+"+.date('c',strtotime('last+day+of+'.+date('F+Y',$my_latest_timestamp))+%2B+86399)+."\r\n\r\n";

$sMonth+=+strtotime('first+day+of+'.+date('F+Y',$my_earliest_timestamp));
$eMonth+=+strtotime('last+day+of+'.+date('F+Y',$my_earliest_timestamp))+%2B+86399;
$xMonth+=+strtotime('%2B1+month',+strtotime('first+day+of+'.+date('F+Y',$my_latest_timestamp)));

while+($eMonth+<+$xMonth)+{
++++echo+"Things+from+".+date('Y-m-d',$sMonth)+."+to+".+date('Y-m-d',$eMonth)+."\r\n\r\n";
++++$sMonth+=+$eMonth+%2B+1;+//add+1+second+to+bring+forward+last+date+into+first+second+of+next+month.
++++$eMonth+=+strtotime('last+day+of+'.+date('F+Y',$sMonth))+%2B+86399;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1238051|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>//ECHO MONTHS BETWEEN TWO TIMESTAMPS
$my_earliest_timestamp = 1532095200;
$my_latest_timestamp = 1554991200;

echo '&lt;pre&gt;';
echo &quot;Earliest timestamp: &quot;. date('c',$my_earliest_timestamp) .&quot;\r\n&quot;;
echo &quot;Latest timestamp: &quot; .date('c',$my_latest_timestamp) .&quot;\r\n\r\n&quot;;

echo &quot;Month start of earliest timestamp: &quot;. date('c',strtotime('first day of '. date('F Y',$my_earliest_timestamp))) .&quot;\r\n&quot;;
echo &quot;Month start of latest timestamp: &quot; .date('c',strtotime('first day of '. date('F Y',$my_latest_timestamp))) .&quot;\r\n\r\n&quot;;

echo &quot;Month end of earliest timestamp: &quot;. date('c',strtotime('last day of '. date('F Y',$my_earliest_timestamp)) + 86399) .&quot;\r\n&quot;;
echo &quot;Month end of latest timestamp: &quot; .date('c',strtotime('last day of '. date('F Y',$my_latest_timestamp)) + 86399) .&quot;\r\n\r\n&quot;;

$sMonth = strtotime('first day of '. date('F Y',$my_earliest_timestamp));
$eMonth = strtotime('last day of '. date('F Y',$my_earliest_timestamp)) + 86399;
$xMonth = strtotime('+1 month', strtotime('first day of '. date('F Y',$my_latest_timestamp)));

while ($eMonth &lt; $xMonth) {
 echo &quot;Things from &quot;. date('Y-m-d',$sMonth) .&quot; to &quot;. date('Y-m-d',$eMonth) .&quot;\r\n\r\n&quot;;
 $sMonth = $eMonth + 1; //add 1 second to bring forward last date into first second of next month.
 $eMonth = strtotime('last day of '. date('F Y',$sMonth)) + 86399;
}
</code></pre>

blocks|key|3352138|text|我发现mtkime()函数在这方面工作得很好：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3352139|$start_date="2021-10-01";
$start_date_plus_a_month=date("Y-m-d",+mktime(0,+0,+0,+date("m",strtotime($start_date))%2B1,+date("d",strtotime($start_date)),+date("Y",strtotime($start_date))));|code-block|syntax|javascript|3352140|结果:+2021-11-01|3352141|我喜欢从'day‘中减去1得到'+2021+-10-31’，如果您想要显示一个跨12个月的范围，例如2021年10月1日到2022年9月30日，这可能会很有用|3352142|$start_date_plus_a_year=date("Y-m-d",+mktime(0,+0,+0,+date("m",strtotime($start_date))%2B12,+date("d",strtotime($start_date))-1,+date("Y",strtotime($start_date))));|3352143|结果:+2022-09-30|3352144|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I find the mtkime() function works really well for this:
<pre class="lang-php prettyprint-override"><code>$start_date=&quot;2021-10-01&quot;;
$start_date_plus_a_month=date(&quot;Y-m-d&quot;, mktime(0, 0, 0, date(&quot;m&quot;,strtotime($start_date))+1, date(&quot;d&quot;,strtotime($start_date)), date(&quot;Y&quot;,strtotime($start_date))));
</code></pre>
result: 2021-11-01
I like to subtract 1 from the 'day' to produce '2021-10-31' which can be useful if you want to display a range across 12 months, e.g. Oct 1, 2021 to Sep 30 2022
<pre class="lang-php prettyprint-override"><code>$start_date_plus_a_year=date(&quot;Y-m-d&quot;, mktime(0, 0, 0, date(&quot;m&quot;,strtotime($start_date))+12, date(&quot;d&quot;,strtotime($start_date))-1, date(&quot;Y&quot;,strtotime($start_date))));
</code></pre>
result: 2022-09-30

Let's say I have a date in the following format: 2010-12-11 (year-mon-day)

With PHP, I want to increment the date by one month, and I want the year to be automatically incremented, if necessary (i.e. incrementing from December 2012 to January 2013).

Regards.

increment date by one month

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。

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假设我有一个以下格式的日期: 2010-12-11 (year-mon-day)使用PHP，我想将日期增加一个月，如果需要的话，我希望年份自动增加(即从2012年12月增加到2013年1月)。致以问候。

问递增日期一个月
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问递增日期一个月EN