Answers for "carbon same date every year month"

carbon months between dates

$to = \Carbon\Carbon::createFromFormat('Y-m-d H:s:i', '2015-5-5 3:30:34');
$from = \Carbon\Carbon::createFromFormat('Y-m-d H:s:i', '2016-6-6 9:30:34');
$diff_in_months = $to->diffInMonths($from);
print_r($diff_in_months); // Output: 1

carbon last day of month in timestamp

// first day of month (2021-01-01 00:00:00)
Carbon::now()->firstOfMonth()->startOfDay()
 
// first day of month in timestamp (1609459200)
Carbon::now()->firstOfMonth()->startOfDay()->timestamp
 
// last day of month (2021-01-31 23:59:59)
Carbon::now()->lastOfMonth()->endOfDay()
 
// last day of month in timestamp (1640995199)
Carbon::now()->lastOfMonth()->endOfDay()->timestamp