PHP | Take day of a date, compare it to the current month and transform it into the previous month

Question

If I have a date that equals: 2020-04-21

and I want to take the day of this date: 21

take the current month: December

calculate it as if it were December then: 2020-12-21

and transform it into the previous month, keeping day and year, then: 2020-11-21

how can I do?

you can play with DateTime library and with strtotime function. it will give what you want — vlad katz, Dec 21 '20 at 11:32
So you basically want to set the month of an existing date. What are the rules when that other month is shorter? — Álvaro González, Dec 21 '20 at 11:47

score 0 · Accepted Answer · answered Dec 21 '20 at 11:45

<?
$time=strtotime('2020-04-21'); // get unixtime of custom date
$day=date('d', $time); // get day of custom date
$year=date('Y', $time); // get year of custom date
$month=date('m'); // get current month

$time_first=mktime(0, 0, 0, $month, $day, $year); // get unixtime for first
$time_second=strtotime('-1 month', $time_first); // get unixtime previous month

$date_first=date('Y-m-d', $time_first); // string format of first date
$date_second=date('Y-m-d', $time_second); // string format of second date

var_dump($date_first);
var_dump($date_second);
?>

PHP | Take day of a date, compare it to the current month and transform it into the previous month

1 Answers1