jQuery addClass example

Change class name on click in jQuery

HTML

<div class="schedule-wrapper" id="js-schedule" data-timezone="et">         /* The value of data-timezone attribute changes on button click from the Screenshot below */ 

   <!-- List of button start -->
   <div class="schedule-action-bar">
      <div class="schedule-timezone-filter">
         Select your timezone:            
         <ul id="js-timezone-picker">
            <li>
               <button id="js-time-et" class="" data-timezone="et">ET</button>
            </li>
         </ul>
      </div>
    </div>
    <!-- List of button end -->

    <div class="schedule-show">
        <div class="schedule-show-time">
             
               <time datetime="03:45 01-08-2019" data-timezone="et">1 août  03:45</time>           /* When timezone is eastern standard time */
        </div>
    </div>
    <div class="schedule-show">
        <div class="schedule-show-time">
               <time datetime="03:45 01-08-2019" data-timezone="et">1 août  03:45</time>           /* When timezone is eastern standard time */
        </div>
    </div>
    <div class="schedule-show">
        <div class="schedule-show-time">
               <time datetime="03:45 01-08-2019" data-timezone="et">1 août    03:45</time>           /* When timezone is eastern standard time */
        </div>
    </div>
    <div class="schedule-show">
        <div class="schedule-show-time">
               <time datetime="03:45 01-08-2019" data-timezone="et">1 août    03:45</time>           /* When timezone is eastern standard time */
        </div>
    </div>
    <div class="schedule-show">
        <div class="schedule-show-time">
               <time datetime="03:45 01-08-2019" data-timezone="et">1 août    03:45</time>           /* When timezone is eastern standard time */
        </div>
    </div>
    <!-- .schedule-show -->
    <div class="schedule-show">
        <div class="schedule-show-time">
               <time datetime="03:45 02-08-2019" data-timezone="et">2 août    03:45</time>           /* When...

JavaScript

// we have to iterate backwards...
$($('.schedule-show').get().reverse()).each(function(i, div){
	let time = $(div).find('[data-timezone="et"]')
  let nextTime = $(div).find('+ .schedule-show [data-timezone="et"]')
  if(nextTime[0]){
  	// check if they dates match
    if(nextTime.text().match(/\d+ \w+/)[0] === time.text().match(/\d+ \w+/)[0]){
      // "white out" the dates that match
    	nextTime.html(nextTime.text().replace(/(\d+ \w+)/, "<font color=\"white\">$1</font>"))
    }
  }
})