date.php

<?php include './functions.php'; ?>
<tr>
    <?php
    	for ($i = 1; $i <= 7; $i++){
    		if ($i < $primer_dia){
    			echo "<td><span></span></td>";
    		}
    		else {
    			echo "<td>".$diap."</td>";
                $diap++;
    		}
    	}
    	echo "</tr><tr>";

        for ($i = 1; $i <= $days_number; $i++) {
            echo "<td>".$diap."</td>";

            if ($i % 7 == 0) echo "</tr><tr>";

            if ($diap == $days_number) break;

            $diap++; 
        }
    ?>
</tr>