[Solved] Call to member function setDate() on string

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You can use t in format specifier on DateTime‘s format function.

date format specifiers

format character: t

Description: Number of days in the given month

Example returned values: 28 through 31

<?php
$input="2017-08-28 10:50:30";

$date_time = DateTime::createFromFormat('Y-m-d H:i:s', $input);
$last_day_of_month = $date_time->format('Y-m-t H:i:s');

echo $last_day_of_month;

This gives:

2017-08-31 10:50:30

Demo: https://eval.in/844314

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solved Call to member function setDate() on string