How to save date and time selected in a calender control display highlighted

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PHP

hello,
I am asked to develop a calender for online theater booking.
in which each date has 3 time slots and if any booking is done in that date and time slot that field should have red background means that time slot for that date is booked.
other 2 slots should be in green background.
please help me in this regards.
I am developing in php and mysql.

below is my code for calender:

<?php
error_reporting(0);
function build_calendar($month,$year,$dateArray) {

     // Create array containing abbreviations of days of week.
     $daysOfWeek = array('S','M','T','W','T','F','S');

     // What is the first day of the month in question?
     $firstDayOfMonth = mktime(0,0,0,$month,1,$year);

     // How many days does this month contain?
     $numberDays = date('t',$firstDayOfMonth);

     // Retrieve some information about the first day of the
     // month in question.
     $dateComponents = getdate($firstDayOfMonth);

     // What is the name of the month in question?
     $monthName = $dateComponents['month'];

     // What is the index value (0-6) of the first day of the
     // month in question.
     $dayOfWeek = $dateComponents['wday'];

     // Create the table tag opener and day headers

     $calendar = "<table class='calendar' border=1>";
     $calendar .= "<caption>$monthName $year</caption>";
     $calendar .= "<tr>";

     // Create the calendar headers

     foreach($daysOfWeek as $day) {
          $calendar .= "<th class='header'>$day</th>";
     } 

     // Create the rest of the calendar

     // Initiate the day counter, starting with the 1st.

     $currentDay = 1;

     $calendar .= "</tr><tr>";

     // The variable $dayOfWeek is used to
     // ensure that the calendar
     // display consists of exactly 7 columns.

     if ($dayOfWeek > 0) { 
          $calendar .= "<td colspan='$dayOfWeek'> </td>"; 
     }
     
     $month = str_pad($month, 2, "0", STR_PAD_LEFT);
  
     while ($currentDay <= $numberDays) {

          // Seventh column (Saturday) reached. Start a new row.

          if ($dayOfWeek == 7) {

               $dayOfWeek = 0;
               $calendar .= "</tr><tr>";

          }
          
          $currentDayRel = str_pad($currentDay, 2, "0", STR_PAD_LEFT);
          
          $date = "$year-$month-$currentDayRel";

          $calendar .= "<td class='day' rel='$date'>$currentDay
		  
		  <table border=1>
		  <tr><td bgcolor='green'>10am-1pm</td></tr>
		  <tr><td bgcolor='yellow'>1.30pm-4.30pm</td></tr>
		  <tr><td bgcolor='green'>5pm-8pm</td></tr>
		  </table>
		  
		  </td>";

          // Increment counters
 
          $currentDay++;
          $dayOfWeek++;

     }
     
     

     // Complete the row of the last week in month, if necessary

     if ($dayOfWeek != 7) { 
     
          $remainingDays = 7 - $dayOfWeek;
          $calendar .= "<td colspan='$remainingDays'> </td>"; 

     }
     
     $calendar .= "</tr>";

     $calendar .= "</table>";

     return $calendar;

}

 $dateComponents = getdate();

     $month = $dateComponents['mon']; 			     
     $year = $dateComponents['year'];

     echo build_calendar($month,$year,$dateArray);

?>