PHP add month to date on a date with day of month 31

Question

I'm using code that works fine on all dates, except 2015-05-31. The code brings me the first day of next month. it works on every date, even if day of month is 31.

$time = strtotime('2015-07-31');
$final = date("Y-m-1", strtotime("+1 month", $time));
echo $final;

output will be --> 2015-08-1.

For some reason on the date 2015-05-31 it returns 2015-07-1 instead of 2015-06-01

$time = strtotime('2015-05-31');
$final = date("Y-m-1", strtotime("+1 month", $time));
echo $final;

Its probably because 6-2014 has 30 days, and 8-2014 has 31 days, so +1 month adds 30 days and not a "month".

How could i get correctly the first day of next month on every date?

Thank you.

possible duplicate of [PHP last day of the month](http://stackoverflow.com/questions/1686724/php-last-day-of-the-month) — rink.attendant.6, Sep 30 '14 at 05:36
The question I linked to tells you how to get the "last day of the current month" and in your question you asked for the "first day of next month". — rink.attendant.6, Sep 30 '14 at 05:48
I know, but the answer there is not solving the problem in this question. — BenB, Sep 30 '14 at 05:56
@rink.attendant.6: created fiddle, can you please try to solve using your link http://ideone.com/9S0Xae — Suresh Kamrushi, Sep 30 '14 at 06:01
@SureshKamrushi I should probably have linked to the exact answer that I was referring to: http://stackoverflow.com/a/18329649/404623 — rink.attendant.6, Sep 30 '14 at 06:11

score 5 · Accepted Answer · answered Sep 30 '14 at 06:06

5

I think this should work -

$time = strtotime("2015-05-31");
echo $final = date("Y-m-d", strtotime("first day of next month", $time));

answered Sep 30 '14 at 06:06

TBI

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It does not understand to string, the return is "1969-12-31". May be depends on php version. Yes, >=5.3 – Cheery Sep 30 '14 at 06:09

score -1 · Answer 2 · answered Sep 30 '14 at 05:37

-1

You can try like this:

<?php
$date = new DateTime('2000-12-31');
$interval = new DateInterval('P1M');

$date->add($interval);
echo $date->format('Y-m-d') . "\n";

$date->add($interval);
echo $date->format('Y-m-d') . "\n";
?>

Output:

2001-01-31
2001-03-03

For more information :http://in3.php.net/manual/en/datetime.add.php

answered Sep 30 '14 at 05:37

Suresh Kamrushi

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If you run your code on 2015-05-31 the output will be "2015-07-01 2015-08-01". same problem. – BenB Sep 30 '14 at 05:44

PHP add month to date on a date with day of month 31

2 Answers2