note 120238 added to datetime.modify
| From: | sinus at sinpi dot net | Date: | Tue, 29 Nov 2016 22:54:12 +0000 |
| Subject: | note 120238 added to datetime.modify | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-207745@lists.php.net to get a copy of this message | ||
A very simple way to ensure we do not cross over month boundaries when adding months is to just go
back a few days if the day number got reset:
<?php
function addMonths($date,$months) {
$orig_day = $date->format("d");
$date->modify("+".$months." months");
while ($date->format("d")<$orig_day &&
$date->format("d")<5) {
$date->modify("-1 day");
}
}
for ($i=0;$i<5;$i++) {
$d = new DateTime("2000-01-10");
addmonths($d,$i);
echo $d->format("Y-m-d")."<br>";
}
for ($i=0;$i<5;$i++) {
$d = new DateTime("2000-01-31");
addmonths($d,$i);
echo $d->format("Y-m-d")."<br>";
}
?>
prints:
2000-01-10
2000-02-10
2000-03-10
2000-04-10
2000-05-10
2000-01-31
2000-02-29
2000-03-31
2000-04-30
2000-05-31
----
Server IP: 72.52.91.14
Probable Submitter: 159.205.249.53
----
Manual Page -- http://php.net/manual/en/datetime.modify.php
Edit -- https://master.php.net/note/edit/120238
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Reject -- https://master.php.net/note/reject/120238
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