DateTime::createFromFormat not working as intended?

I'm writing a php script to display as follows:

December 2020  2020-12-01  2020-12-31    January 2021  2021-01-01  2021-01-31    Febuary 2021  2021-02-01  2021-02-28    March 2021  2021-03-01  2021-03-31  

Basically to display date from the very beginning and ends with the latest month. But i got an error upon executing.

Fatal error: Call to a member function format() on boolean  

From my understanding, DateTime::createFromFormat is supposed to parse any string based on a given format to another format that can be found on date() But instead i got error and I tried old ways like using date("Y-m-01", strtotime($month)) but php outputs 1970-01-01 and 1970-01-31

My code:

$veryfirstmonth = "2020-12-01 18:01:15";  $veryfirstmonth = date('Y-m-d', strtotime($veryfirstmonth));  $today = date("Y-m-d");    $start = (new DateTime($veryfirstmonth))->modify('first day of this month');  $end = (new DateTime($today))->modify('first day of this month');  $interval = DateInterval::createFromDateString('1 month');  $period = new DatePeriod($start, $interval, $end);    foreach ($period as $dt) {      echo $month = $dt->format("F Y") . "<br>\n";      //Convert $month into start of month and end of month again  //    echo $start = date("Y-m-01", strtotime($month));  //    echo $end = date("Y-m-t", strtotime($month));      $start = DateTime::createFromFormat("F Y", $month)->format("Y-m-01");      $end = DateTime::createFromFormat("F Y", $month)->format("Y-m-t");        echo "Start: " . $start . "\n";      echo "End: " . $end . "\n\n";  }  

https://stackoverflow.com/questions/67223042/datetimecreatefromformat-not-working-as-intended April 23, 2021 at 10:03AM