get a wrong next month in PHP

Question

Today is 31^st May

$currentM = date('m');
// 05

$nextM = date('m', strtotime('+1 month'));
// 07

What am I doing wrong? I don't understand why the next month is giving 07.

Define how "+1 month" *should* work first. You'll find it's kind of a tough definition. — deceze, May 31 '13 at 10:22

bwoebi · Accepted Answer · 2013-05-31T10:28:20.783

11

The next month from today (31/5) is the 31/6 which doesn't exist, so it forwards to the 1/7.

You may want to increment the actual month: $nextM = date('m') % 12 + 1

edited May 31 '13 at 10:28

answered May 31 '13 at 10:20

bwoebi

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Try to use `$currentM = date('m'); $nextM = $currentM+1` works for me – Modestas Stankevičius May 31 '13 at 10:22
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kind of laughed a bit – nl-x May 31 '13 at 10:23
if `date('m')` is `12` ? – BlitZ May 31 '13 at 10:25
@l2aelba the may is the fifth month? – bwoebi May 31 '13 at 10:25
1

That is !!!!! 31/6 doesn't exist so 1/7 , I understand now ! Damm me ! – l2aelba May 31 '13 at 10:26
1

@l2aelba today is 31/05 in the UK, though I know there are parts of the world where it's 30/05, and some where it's already 1/06 – Mark Baker May 31 '13 at 10:26
This answer is wrong though. Because just incrementing the month with 1 will produce 13 when in Decembre. – nl-x May 31 '13 at 10:28
@MarkBaker He wrote in his question that today is the 31/5? – bwoebi May 31 '13 at 10:28

score 3 · Answer 2 · answered May 31 '13 at 10:26

3

try :

$d = new DateTime();
$d->modify('first day of next month');
echo $d->format('m');

answered May 31 '13 at 10:26

nl-x

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score 1 · Answer 3 · edited May 31 '13 at 10:32

1

You can use any of the following snippets,

$month = date('n') % 12 + 1;

(OR)

$month = date('m', strtotime('+1 months'));

(OR)

$month = date('m') + 1

edited May 31 '13 at 10:32

khellang

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answered May 31 '13 at 10:26

Vinoth Babu

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The second one did specifically *not* work, the third one will eventually give you "13". – deceze May 31 '13 at 10:34

score 1 · Answer 4 · answered May 31 '13 at 10:30

The problem is that today is the 31st. Adding a month may overlap 2 months.

I usually simply solve this by using day 1 to add a month and using day 28 to substract a month:

 echo(date('m'));
 echo "\n";
 echo(date('m', strtotime(date('Y-m-28') . ' -1 month'))); // day 28 - 1 month
 echo "\n";
 echo(date('m', strtotime(date('Y-m-1') . ' +1 month'))); // day 1 + 1 month

Output:

05
04
06

get a wrong next month in PHP

4 Answers4