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HTML

              
                
<form>
  <h1>Date picker</h1>
  <p>A demonstration of a custom Javascript date picker. Click on the birth date field to toggle.</p>
  <div class='formInput'>
    <i class='fa fa-user'></i>
    <input type='text' name='name' placeholder='Name' />
  </div>
  <div class='formInput'>
    <i class='fa fa-envelope-o'></i>
    <input type='text' name='email' placeholder='Email' />
  </div>
  <div class='formInput dateSelector'>
    <i class='fa fa-calendar-o'></i>
    <input type='text' name='birthday' id='hbdsdf' placeholder='Birth date' />
  </div>
  <input type="submit" class='button' value='Submit'>
    <div class='footnote'>Resources used: icons/font awesome, fonts/google web fonts</div>
</form>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Lato:100,300,400,700,900');
@import url('https://fonts.googleapis.com/css?family=Open+Sans:400,300,600,700,800');
@import url('https://fonts.googleapis.com/css?family=Montserrat:400,700');
@import url('https://netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css');

h1 {
  font: 100 4em/1em Lato;
  margin: 0;
  text-transform: uppercase;
}
body {
    font: 300 16px/1.5em "Open Sans";
}
.footnote {
  margin: 40px 0 0 20px;
  font-weight: 500; font-size: 0.75em;
  color: #a0a0a0;
}

form {
  width: 400px;
  padding: 80px 0 0 40px;
}



input.button {
    box-sizing: border-box;
    border: 0;
    outline: 0;
    height: 48px;
}
.button {
    display: inline-block;
    font: 100 1.2em/16px "Lato";
    letter-spacing: 0.75px;
    text-transform: uppercase;
    text-align: center;
    height: 16px;
    margin: 8px 0 8px 8px;
    padding: 16px 24px;
    background: #808080;
    color: white;
    border-radius: 3px;
    box-shadow: 1px 1px 3px rgba(0,0,0,0.25);
    transition:  background-color .1s, color .2s, box-shadow .3s;
}
.button:hover {
    background: #404040;
    color: white;
    cursor: pointer;
    cursor: hand;
    box-shadow: 1px 1px 6px rgba(0,0,0,0.65);
}
.formInput {
    position: relative;
    font: 300 1em/48px "Open Sans";
    margin: 0 0 8px;
    padding: 0;
    border-bottom: 1px solid #c0c0c0;
    border-radius: 4px;
    overflow: hidden;
    color: #505050;
}
.formInput:hover {
    color: black;
}
.formInput i {
    display: block;
    position: absolute;
    z-index: -1;
    top: 0;
    left: 0;
    width: 48px;
    height: 47px;
    line-height: 48px;
    text-align: center;
    /*background-color: #e0e0e0;
    box-shadow: 1px 1px 1px rgba(0,0,0,0.25);*/
    font-size: 1em;
    transition: box-shadow .2s, color .3s, background-color .4s;
}
.formInput input {
    box-sizing: border-box;
    z-index: 1;
    display: block;
    position: relative;
    top: 0;
    left: 0;
    float: left;
    font-size: 1em;
    font: inherit;
    border: 0;
    margin: 0;
    padding: 0 4px 0 56px;
    border: 1px solid transparent;
    border-radius: inherit;
    width: 100%;
    height: 47px;
    line-height: 47px;
    background: transparent;
    color: inherit;
    transition: border-color .2s, color .2s, background-color .4s;
}

.formInput.hasTextarea {
    line-height: 24px;
    height: 191px;
}
.formInput.hasTextarea i {
    border-radius: 0 0 3px;
}
.formInput textarea {
    box-sizing: border-box;
    resize: none;
    z-index: 1;
    display: block;
    position: relative;
    top: 0;
    left: 0;
    float: left;
    font-size: 1em;
    font: inherit;
    border: 1px solid transparent;
    border-radius: inherit;
    margin: 0;
    padding: 12px 4px 6px 56px;
    width: 100%;
    height: 100%;
    line-height: 24px;
    background: transparent;
    color: inherit;
    transition: border-color .2s, color .2s, background-color .4s;
}
.formInput input[disabled]:active,.formInput input[disabled]:focus,
.formInput input[disabled]:hover {
    border-color: transparent;
    background-color: transparent;
}
.formInput input:active, .formInput input:focus,
.formInput textarea:active, .formInput textarea:focus,
.formInput.dateSelector:hover input{
    border-color: #b0b0b0;
    outline: none;
    color: black;
    background-color: rgba(0,0,0,0.025);
}
.formInput.radioBtn {
    padding-bottom: 24px;
}
.formInput.radioBtn .formInputChild {
    font: 300 1em/28px "Open Sans";
}
.formInput.radioBtn input {
    width: 14px;
    height: 14px;
    padding: 0;
    margin: 7px 9px;
    position: relative;
}
.formInput.radioBtn label {
    font-size: 0.95em;
}

.formInput .formInputDescription {
    position: relative;
    padding: 0 0 0 56px;
}
.formInput .formInputChild {
    font: 300 1em/48px "Open Sans";
    position: relative;
    padding: 0 0 0 56px;
}
.formInput.checkboxBtn {

}
.formInput.checkboxBtn input {
    width: 14px;
    height: 14px;
    margin: 17px 16px 16px;
    padding: 0;
}
.formInput.checkboxBtn i {
    display: none;
}
.formInput.dateSelector {
    transition: background-color .2s;
}




.calendar {
    position: relative;
    display: block;
    font: 500 0.8em/30px "Open Sans";
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    cursor: default;
    padding: 0 0 0 57px;
    color: #404040;
}
.calendar .view {
    position: relative;
    float: left;
}
.calendar .nav {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
}
.calendar .nav .btn {
    position: absolute;
    display: block;
    z-index: 1;
    cursor: pointer;
    cursor: hand;
    width: 32px;
    height: 32px;
    line-height: 31px;
    top: 0;
    left: auto;
    transition: opacity .5s;
    border-radius: 4px;
}
.calendar .nav .btn:hover {
    color: #808080;
    background: #e0e0e0;
    border-color: #606060;
}

.calendar .nav .prev {
    left: 0;
}

.calendar .nav .prev-year {
    opacity: 0;
    left: 32px;
}
.calendar .nav:hover .prev-year {
    opacity: 1;
}
.calendar .nav .next-year {
    opacity: 0;
    right: 32px !important;
}
.calendar .nav:hover .next-year {
    opacity: 1;
}

.calendar .nav .next {
    right: 0;
}



.calendar .head {
}
.calendar .head .title {
    font: 300 1.2em/32px "Open Sans";
    position: relative;
    float: left;
    width: 100%;
    text-align: center;
}
.calendar .head span {
    cursor: pointer;
}
.calendar .row {
    clear: both;
}
.calendar .row.th {
    font-weight: 700;
    text-transform: uppercase;
    height: 40px;
}
.calendar .row.th .C {
    border-bottom: 1px solid #c0c0c0;
    border-radius: 0;
}
.calendar .C {
    text-align: center;
    width: 40px;
    height: 40px;
    line-height: 40px;
    float: left;
    transition: background-color .05s, color .05s;
    border-radius: 50%;
}
.calendar .C.mn {
    cursor: pointer;
    cursor: hand;
}
.calendar .C.mn:hover {
    background: #565656;
    color: white;
}
.calendar .C.g {
    color: #a0a0a0;
    font-weight: 300;
}
.calendar .C.slctd {
    background: #202020;
    color: white;
    font-size: 1.15em;
    font-weight: 300;
}
.calendar .C.today {
    font-weight: 900;
    font-size: 1.3em;
}

.calendar .selected {
    margin: 0 0 0 64px;
    float: right;
    text-align: center;
    width: 280px;
}
.calendar .selected .desc {
    border-bottom: 1px solid #c0c0c0;
}

.calendar .selected .val {
    padding: 0 8px;
    background: #f0f0f0;
    color: #808080;
}


.calendar .dayArea {
    position: relative;
    width: 280px;
    height: 240px;
    overflow: hidden;
}
.calendar .dayArea .mArea {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
              
            
!

JS

              
                
        var monthNames = {
            0: "January",
            1: "February",
            2: "March",
            3: "April",
            4: "May",
            5: "June",
            6: "July",
            7: "August",
            8: "September",
            9: "October",
            10: "November",
            11: "December"
        }

        function Cal() {
            this.date = {};
            this.markup = {};
            this.date.today = new Date();
            this.date.today = new Date(this.date.today.getUTCFullYear(),this.date.today.getUTCMonth(),this.date.today.getUTCDate());
            this.date.browse = new Date();
            this.markup.row = "row";
            this.markup.cell = "cell";
            this.markup.inactive = "g";
            this.markup.currentMonth = "mn";
            this.markup.slctd = "slctd";
            this.markup.today = "today";
            this.markup.dayArea = "dayArea";
            this.elementTag = 'calendar';
            this.targetInput = '#hbdsdf';
            this.init = false;
            this.buildDOM();
            this.selectDate(this.date.today.getFullYear(),this.date.today.getMonth(),this.date.today.getDate())
            this.constructDayArea();
            this.updateInput('Birth date','','');


            t = this;
            $(document).ready(function(){
                $(document).click(function(ms){
                    e = $('.'+t.elementTag+' .view');
                    eco = e.offset();
                    if(ms.pageX<eco.left || ms.pageX>eco.left+e.width() || ms.pageY<eco.top || ms.pageY>eco.top+e.height()) {
                        if(!t.init) t.hide(300);
                    }
                });
                $('.'+t.elementTag).on('click','.next-month',function(){
                    t.setMonthNext();
                });
                $('.'+t.elementTag).on('click','.prev-month',function(){
                    t.setMonthPrev();
                });
                $('.'+t.elementTag).on('click','.next-year',function(){
                    t.setYearNext();
                });
                $('.'+t.elementTag).on('click','.prev-year',function(){
                    t.setYearPrev();
                });

                $('.'+t.elementTag).on('click','.jump-to-next-month',function(){
                    t.setMonthNext();
                });
                $('.'+t.elementTag).on('click','.jump-to-previous-month',function(){
                    t.setMonthPrev();
                });

                $('.'+t.elementTag).on('click','.'+t.markup.currentMonth,function(){
                    d = t.selectDate(t.date.browse.getUTCFullYear(),t.date.browse.getUTCMonth(),$(this).html());
                    t.hide(300);
                });

                $('.'+t.elementTag).on('click','.title',function(){
                    t.date.browse = new Date(t.date.today.getTime());
                    t.constructDayArea(false);
                });

                $(t.targetInput).focus(function(){
                    t.show(100);
                    $(this).blur();
                });

            });


        }
        Cal.prototype.wd = function(wd) {
            if(wd==0) return 7
            return wd
        }
        Cal.prototype.buildDOM = function() {
            html = "<div class='clear "+this.elementTag+"'>\n<div class='view'>\n<div class='head'>\n<div class='title'><span class='m'></span> <span class='y'></span></div>\n</div>\n";
            html += "<div class='row th'>\n<div class='C'>M</div>\n<div class='C'>T</div>\n<div class='C'>W</div>\n<div class='C'>T</div>\n<div class='C'>F</div>\n<div class='C'>S</div>\n<div class='C'>S</div>\n</div>\n<div class='"+this.markup.dayArea+"'>\n";
            html += "</div>\n\n<div class='row nav'>\n\n<i class='btn prev prev-year fa fa-fast-backward'></i>\n<i class='btn prev prev-month fa fa-play fa-flip-horizontal'></i>\n<i class='btn next next-month fa fa-play'></i>\n<i class='btn next next-year fa fa-fast-forward'></i>\n</div>\n</div>\n</div>\n";
            $(html).insertAfter(this.targetInput);
            $(this.targetInput).css('cursor','pointer');
            this.hide(0);
        }
        Cal.prototype.constructDayArea = function(flipDirection) {
            newViewContent = "";
            wd = this.wd(this.date.browse.getUTCDay());
            d = this.date.browse.getUTCDate();
            m = this.date.browse.getUTCMonth();
            y = this.date.browse.getUTCFullYear();

            monthBgnDate = new Date(y,m,1);
            monthBgn = monthBgnDate.getTime();
            monthEndDate = new Date(this.getMonthNext().getTime()-1000*60*60*24);
            monthEnd = monthEndDate.getTime();

            monthBgnWd = this.wd(monthBgnDate.getUTCDay());
            itrBgn = monthBgnDate.getTime()-(monthBgnWd-1)*1000*60*60*24;
            /*itrEnd = monthEnd;
            i = 0;
            while(this.wd(new Date(itrEnd).getUTCDay())!=7) {
                itrEnd += 1000*60*60*24;
                i = i+1;
                if(i>10) break;
            }*/



            i = 1;
            n = 0;
            dayItr = itrBgn;
            newViewContent += "<div class='"+this.markup.row+"'>\n";
            while(n<42) {
                cls = new Array("C",this.markup.cell);
                if(dayItr<=monthBgn) cls.push(this.markup.inactive,"jump-to-previous-month");
                else if(dayItr>=monthEnd+1000*60*60*36) cls.push(this.markup.inactive,"jump-to-next-month");
                else cls.push(this.markup.currentMonth);
                if(dayItr==this.date.slctd.getTime()+1000*60*60*24) cls.push(this.markup.slctd);
                if(dayItr==this.date.today.getTime()+1000*60*60*24) cls.push(this.markup.today);

                date = new Date(dayItr);
                newViewContent += "<div class='"+cls.join(" ")+"'>"+date.getUTCDate()+"</div>\n";
                i += 1;
                if(i>7) {
                    i = 1;
                    newViewContent += "</div>\n<div class='"+this.markup.row+"'>\n";
                }
                n += 1;
                dayItr = dayItr+1000*60*60*24;
            }
            newViewContent += "</div>\n";


            this.changePage(newViewContent,flipDirection);
            $('.'+this.elementTag+' .title .m').html(monthNames[m]);
            $('.'+this.elementTag+' .title .y').html(y);
            return newViewContent;
        }
        Cal.prototype.changePage = function(newPageContent,flipDirection) {

            multiplier = -1;
            mark = "-";
            if(flipDirection) {
                multiplier = 1;
                mark = "+";
            }

            oldPage = $('.'+this.elementTag+' .'+this.markup.dayArea+' .mArea');
            newPage = $("<div class='mArea'></div>").css('left',(-1*multiplier*224)+'px').html(newPageContent);
            $('.'+this.elementTag+' .'+this.markup.dayArea).append(newPage);

            $('.mArea').stop(1,1).animate({
                left: mark+"=224px"
            },300,function(){
                oldPage.remove();
            });
        }
        Cal.prototype.selectDate = function(y,m,d) {
            this.date.slctd = new Date(y,m,d);
            this.updateInput(y,m,d);
            this.constructDayArea(false);
            return this.date.slctd;
        }
        Cal.prototype.updateInput = function(y,m,d) {
            if(m=='') m = '';
            else m = monthNames[m];
            $(this.targetInput).val(y+" "+m+" "+d);
        }
        Cal.prototype.getMonthNext = function() {
            m = this.date.browse.getUTCMonth();
            y = this.date.browse.getUTCFullYear();
            if(m+1>11) return new Date(y+1,0);
            else return new Date(y,m+1);
        }
        Cal.prototype.getMonthPrev = function() {
            m = this.date.browse.getUTCMonth();
            y = this.date.browse.getUTCFullYear();
            if(m-1<0) return new Date(y-1,11);
            else return new Date(y,m-1);
        }
        Cal.prototype.setMonthNext = function() {
            m = this.date.browse.getUTCMonth();
            y = this.date.browse.getUTCFullYear();
            if(m+1>11) {
                this.date.browse.setUTCFullYear(y+1);
                this.date.browse.setUTCMonth(0);
            } else {
                this.date.browse.setUTCMonth(m+1);
            }
            this.constructDayArea(false);
        }
        Cal.prototype.setMonthPrev = function() {
            m = this.date.browse.getUTCMonth();
            y = this.date.browse.getUTCFullYear();
            if(m-1<0) {
                this.date.browse.setUTCFullYear(y-1);
                this.date.browse.setUTCMonth(11);
            } else {
                this.date.browse.setUTCMonth(m-1);
            }
            this.constructDayArea(true);
        }
        Cal.prototype.setYearNext = function() {
            y = this.date.browse.getUTCFullYear();
            this.date.browse.setUTCFullYear(y+1);
            this.constructDayArea(false);
        }
        Cal.prototype.setYearPrev = function() {
            y = this.date.browse.getUTCFullYear();
            this.date.browse.setUTCFullYear(y-1);
            this.constructDayArea(true);
        }
        Cal.prototype.hide = function(duration) {
            $('.'+this.elementTag+' .view').slideUp(duration);
        }
        Cal.prototype.show = function(duration) {
            t = this;
            t.init = true;
            $('.'+this.elementTag+' .view').slideDown(duration,function(){
                t.init = false;
            });
        }

        var c = new Cal();
              
            
!
999px

Console