$('.day a').click(function(){
alert("day is"+?);
alert("month is"+?);
alert("year is"+?);
});
<div class="day fri past">
<a data-day="10" data-month="3" data-year="2017" id="date_1" >10</a>
</div>
<div class="day fri past">
<a data-day="20" data-month="31" data-year="2017" id="date_2" >10</a>
</div>
<div class="day fri past">
<a data-day="12" data-month="3" data-year="2017" id="date_3">10</a>
</div>
(function(){
var day=$('#date_1').data('day');
var month=$('#date_1').data('month');
var year=$('#date_1').data('year');
alert(day+'\n'+month+'\n'+year);
})();
<div class="day fri past">
<a data-day="10" data-month="3" data-year="2017" >10</a>
</div>
<div class="day fri past">
<a data-day="20" data-month="31" data-year="2017" >10</a>
</div>
<div class="day fri past">
<a data-day="12" data-month="3" data-year="2017" >10</a>
</div>
($(function(){
var allAnchorElements=document.querySelectorAll('a');
for(var i=0;i<=allAnchorElements.length;i++){
var dayi=allAnchorElements[i].dataset.day;
var monthi=allAnchorElements[i].dataset.month;
var yeari=allAnchorElements[i].dataset.year;
alert(dayi+'\n'+monthi+'\n'+yeari);
}
}));
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