From Last Month To Current Month Get or Set Any Date Dynamically In PHP & Get Date Difference(How Many Days)

$date1 = date("Y-m-d", strtotime("first day of last month"));

echo $datestart = date('Y-m-d', strtotime("+4 days", strtotime($date1))); // date start 

$date2 = date("Y-m-d", strtotime("first day of this month"));

echo $dateend = date('Y-m-d', strtotime("+4 days", strtotime($date2))); // date end

Output:

2020-09-05

2020-10-05

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$from_date = date("Y-m-d", strtotime('2020-09-05'));

$today_date = date('2020-10-01'); //date('Y-m-d');

$date1 = new DateTime($from_date);

$date2 = new DateTime($today_date);

$diff = $date1->diff($date2);

echo $diff->days;

Output: 26

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