what is the best way to compare date?

The best I've tried is to convert both date to milliseconds using the PHP strtotime("{date}") then compare both dates.

Example

$date1 = strtotime(date("d-m-y"));
$date2 = strtotime(date("d-m-y"));

if ($date2 >= $date1){
    echo 'Date 2 is greater than Date 1';
}else{
    echo 'Date 1 is greater than Date 2';
}

I hope it's helpful?

sorry for this questioned silly questioned i have to use "<=" like

$attendance = Attendance::
                           where('teacher_id', $teachrID)
                           ->whereDate('date' ,'<=' , $today)->first();  

See comparison examples here, you will need lte http://carbon.nesbot.com/docs/#api-comparison

@jlrdw carbon comparisons are not relevant in a sql query

@vipin93 does not explain where $today comes from?

I see you have marked it answered so I suppose you got your solution?

@Snapey yes I got solution

$today = Carbon::today()->format('Y-m-d');