This is a file of r & d for starting date of current quarter, ending date of current quarter , starting date of previous quarter , ending date of previous quarter.

quarter date carbon.php

<?php
        echo "start of current quarter date: ";
        $startofQuarter =  Carbon::now()->startOfQuarter();
        echo $startofQuarter;
        echo "\n";

        echo "end of current quarter date: ";
        $startofQuarter =  Carbon::now()->endOfQuarter();
        echo $startofQuarter;
        echo "\n";


        echo "previous quarter starting date: ";
        $previousQuarter =  Carbon::now()->startOfQuarter()->subMonths(3)->format('Y-m-d');
        echo $previousQuarter;
        echo "\n";


        echo "previous quarter ending date: ";
        $previousQuarter =  Carbon::make($previousQuarter)->endOfQuarter()->format('Y-m-d');
        echo $previousQuarter;
        echo "\n";

        exit;