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@ 2018-05-10T10:17:07Z

<?php

print_r(getFirstDayInMonth(new DateTime()));

function getFirstDayInMonth($date)
    {
        $firstDayInMonth = $date->modify("first day of this month");
        
        if($firstDayInMonth->format("Y-m-d") == date("Y-m-d", easter_date($firstDayInMonth->format($firstDayInMonth->format("Y")))))
                $firstDayInMonth->modify("+2 days"); // posunutí z neděle na úterý

        if($firstDayInMonth->format($firstDayInMonth->format("Y")) == 2024)
            $firstDayInMonth->modify("+1 day");



        // 1. leden
        if($firstDayInMonth == new DateTime("1.1.".$firstDayInMonth->format("Y")))
                $firstDayInMonth->modify("+1 day"); 
        // 1. květen
        print_r($firstDayInMonth);
        print_r(new DateTime($firstDayInMonth->format("Y") . "-05-01"));
        if($firstDayInMonth == new DateTime($firstDayInMonth->format("Y") . "-05-01"))
            $firstDayInMonth->modify("+1 day"); 

        // zjištění dnu v týdnu
        $numberOfDay = $firstDayInMonth->format("w");
            
        //sobota
        if($numberOfDay == 6) 
            $firstDayInMonth = $firstDayInMonth->modify("+2 days");
        // neděle
        if($numberOfDay == 0) // ne
            $firstDayInMonth = $firstDayInMonth->modify("+1 day");

        return $firstDayInMonth;

    }

Output for 7.3.24 - 7.3.33, 7.4.12 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: Fatal error: Uncaught Error: Call to undefined function easter_date() in /in/dYgTE:9 Stack trace: #0 /in/dYgTE(3): getFirstDayInMonth(Object(DateTime)) #1 {main} thrown in /in/dYgTE on line 9
Process exited with code 255.
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 7.2.3: DateTime Object ( [date] => 2018-05-01 12:17:07.004953 [timezone_type] => 3 [timezone] => Europe/Amsterdam ) DateTime Object ( [date] => 2018-05-01 00:00:00.000000 [timezone_type] => 3 [timezone] => Europe/Amsterdam ) DateTime Object ( [date] => 2018-05-01 12:17:07.004953 [timezone_type] => 3 [timezone] => Europe/Amsterdam )

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