PHP 或 Laravel 下个月的最后一天

Question

When I try to get the last day of next month by PHP or Laravel carbon, everything is ok, but when I try to get the last day of next month from a specific date, 2023-01-31, by

date('Y-m-01', strtotime('next month', strtotime('2023-01-31')));

OR

Carbon::createFromFormat('Y-m-d H:m:00:000', '2023-01-31')->addMonth()->format('Y-m-t H:m:00:000');

That time output results are given on 2023-03-31, but the last day of next month is 2023-02-28. So how can I solve it? It's not working correctly.

$instituter = Institute::where('code', $instInfo->institute_code)->first();
            // $institute = Carbon::createFromFormat('Y-m-d H:m:00:000', $institute->institute_expire)->addMonth()->format('Y-m-d H:m:00:000');
            // $expire = $instituter->institute_expire;
            // $inst = Carbon::createFromFormat('Y-m-d H:i:00.000', $instituter->institute_expire)->addMonths(6)->startOfMonth()->format('Y-m-d');
            $inst = date('Y-m-01', strtotime('next month', strtotime($instituter->institute_expire)));
            // $inst = Carbon::createFromFormat('Y-m-d H:i:00.000', $instituter->institute_expire)->addMonths(6)->startOfMonth();
            // $institute = Carbon::createFromFormat('m/d/Y', $instituter->institute_expire)->addMonth();

Answer 1

Try the following.

$date = Carbon::createFromFormat('Y-m-d', '2023-01-31');
$nextMonth = $date->modify('Last Day of Next Month');
echo $nextMonth->format('Y-m-d');

This will output 2023-02-28 .

Answer 2

A date is given as a string.

$strDate = '2023-01-15';

Based on this date, a date object is to be created for the last day of the following month. With DateTime this can be done in one line.

$lastDdayOfNextMonth = date_create('last day of next month '.$strDate);

Carbon is an extension of DateTime. Therefore this also works:

$lastDdayOfNextMonth = Carbon::create('last day of next month '.$strDate);

echo $lastDdayOfNextMonth->format('c');
//2023-02-28T00:00:00+01:00

If the date already exists as an object, it becomes even easier.

$dt = new DateTime('2023-01-15');

$lastDdayOfNextMonth = $dt->modify('last day of next month');

This works exactly the same with carbon again.

$dt = new Carbon('2023-01-15');

$lastDdayOfNextMonth = $dt->modify('last day of next month');

Beware of solutions with addMonth() with Carbon or just 'next Month' for DateTime. Older versions also return incorrect results for the date "2023-01-31" as with the question. Carbon has a special method for adding months 'without overflow': addMonthsNoOverflow()

$endOfNextMonth = Carbon::create('2023-01-31')
  ->addMonthsNoOverflow(1)
  ->endOfMonth()
;

echo $endOfNextMonth;  //2023-02-28 23:59:59

Answer 3

From Laravel 5.5 you can use now() function to get the current date and time and you can get the last date of next month using:

now()->addMonth()->endOfMonth();

if you want to format to Ymd

now()->addMonth()->endOfMonth()->format('Y-m-d');

or if you want to get only date change format to $now->format('d');

if you are using laravel version less than 5.5 using the above functions as

\Carbon\Carbon::now()->addMonth()->endOfMonth();

Answer 4

strtotime will do this...

eg

echo date('c', strtotime('last day of next month'));

gives eg 2023-02-28T19:53:34+00:00, when today is 2023/01/21.

Alternatively -

ècho (new DateTime('last day of next month'))->format('c')

will also work

Answer 5

$next_month_last_date = date("Y-m-t", strtotime("+1 month"));

t => number of days in the month