add class if date is today
$(function() {
var date = new Date(),
currentDate = date.getFullYear() + "-" + (date.getMonth() + 1) + "-" + date.getDate();
$(".grid-item").each(function() {
var specifiedDate = $(this).data('date');
if (specifiedDate == currentDate) {
$(this).addClass('today');
} else if (currentDate > specifiedDate) {
$(this).addClass('past');
} else {
$(this).addClass('future');
}
});
});