strtotime 因新年（2022 年）的变化而停止工作

Question

I have the following piece of code to find next month, if before the 20th, and two months out, if after the 20th. Then it converts the month number to a character.

Before January 2022 I was able to get the number of the month using

$month =  strtotime($current_month);

After some searching around I got it working by changing that piece of code to

$month = date_format($current_month, 'm');

Any help as to why it stopped working or if the date_format is the proper way to go would be greatly appreciated. Thanks

// get day of month without leading zero
$today = date("j");

//if before 20th get next month, else get two months out
IF ($today < 20) {
    $time =  new DateTime();
    $current_month = $time->modify('+1 months');
}else{  
    $time =  new DateTime();    
    $current_month = $time->modify('+2 months');
}

**//  before January 2022 this worked:  $month =  strtotime($current_month);
//after January 2022 I changed code to this to work
$month = date_format($current_month, 'm');**

    $code = array (
    '01' => 'f',
    '02' => 'g',
    '03' => 'h',
    '04' => 'j',
    '05' => 'k',
    '06' => 'm',
    '07' => 'n',
    '08' => 'q',
    '09' => 'u',
    '10' => 'v',
    '11' => 'x',
    '12' => 'z');

$month_code = $code[$month];

Answer 1

Use **$month = date_format($current_month, 'm');**

Instead of *$month = strtotime($current_month);*