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HTML

              
                svg.svg-icon__sprite
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    symbol#dot(viewbox='0 0 32 32')
      title Dit icon.
      desc For interactions.
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    symbol#arrow(viewbox='0 0 32 32')
      title Arrow icon.
      desc For interactions.
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      title Eye icon.
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      title Firefox icon.
      desc Support for this browser.
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    symbol#chrome(viewbox='0 0 32 32')
      title Chrome icon.
      desc Support for this browser.
      path(d='M8.2 14.1L3.7 6.3c2.9-3.6 7.4-6 12.4-6C21.9.3 27 3.4 29.7 8.1H16.1c-3.8 0-7 2.5-7.9 6zm13.6-3.7h9.1c.7 1.8 1.1 3.7 1.1 5.8 0 8.7-7 15.7-15.7 15.8l6.5-11.2c.9-1.3 1.4-2.9 1.4-4.6 0-2.3-.9-4.3-2.4-5.8zm-11.5 5.8c0-3.2 2.6-5.8 5.8-5.8s5.8 2.6 5.8 5.8-2.6 5.8-5.8 5.8-5.8-2.7-5.8-5.8zm8 7.8l-4.5 7.9C6.1 30.7.2 24.1.2 16.2c0-2.8.7-5.5 2-7.8l6.5 11.2c1.3 2.8 4.1 4.7 7.3 4.7.8 0 1.6-.1 2.3-.3z')
    symbol#safari(viewbox='0 0 32 32')
      title Safari icon.
      desc Support for this browser.
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      title Edge icon.
      desc Support for this browser.
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      title iExplorer icon.
      desc Support for this browser.
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main.flexy__item.flexy--items-center.flexy--justify-center.flexy--column
  section.section.flexy__item.flexy--column.flexy--items-center
    header.header.accessible-hide
      h2 Infinite Calendar
    article.section__article.flexy__item.flexy--column.flexy--items-center
      header.header.accessible-hide
        h3 A liquid & 'light-weight' calendar without any library.
      .calendar
        .calendar__month
          ul#CALENDAR__CONTROLS.calendar__controls.flexy__item.flexy--between.space--small
          table#CALENDAR__TABLE.calendar__table.flexy__item.flexy--column(width='100%' height='100%')
            thead#CALENDAR__THEAD.calendar__thead
            tbody#CALENDAR__TBODY.calendar__tbody
  header.header
      h1
        a(href='http://tadaima.studio' title='Go to Tadaima')
          svg.logo-tadaima.fill--white(xmlns='http://www.w3.org/2000/svg' xml:space='preserve' viewBox='0 0 80 80')
            title Tadaima Studio.
            desc A group of digital interface crafters.
            g
              rect.st5(y='0', width='80', height='80')
            lineargradient#SVGID_1_(gradientunits='userSpaceOnUse', x1='27.7468', y1='18.248', x2='52.244', y2='42.7452')
              stop(offset='0', style='stop-color:#FF5572')
              stop(offset='1', style='stop-color:#FF7555')
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svg.svg-bg(xmlns='http://www.w3.org/2000/svg')
  defs
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    use.svg-bg_element.opacity-anim(mask='url(#j)', stroke-width='6', xmlns:xlink='http://www.w3.org/1999/xlink', xlink:href='#c')
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!

CSS

              
                @keyframes changeMonth {
    50% {
        transform: translate(0,120%);
    }
}

.calendar {
    width: 35em;
    @media (max-width: 40em) {
        width: 100%;
    }
    height: 26.75em;
    position: relative;
    &__table {
        width: 100%;
        height: 21.875em;
        tr {
            width: 100%;
        }
    }
    &__tbody,
    &__thead {
        display: inline-block;
        position: relative;
        box-sizing: border-box;
        width: 100%;
    }
    &__thead  {
        height: 3.813em;
        padding: ($baseSize / 2);
        z-index: 2;
        background-color: $gray;
        color: $white;
        box-shadow: 0 .1em 1em 0 rgba($black, .25),
                    0 .1em .5em 1px rgba($black, .35),
                    0 1em 2em 1px rgba($black, .15);
        .calendar__month__day {
            font-size: .75em;
            text-transform: uppercase;
        }
    }
    &__tbody {
        height: 19.438em;
        background-color: $white;
        padding: $baseSize ($baseSize / 2);
        transform: translateY(0);
        z-index: 1;
        box-shadow: 0 .1em 1em 0 rgba($black, .25),
                    0 .1em .5em 1px rgba($black, .35),
                    0 1em 2em 1px rgba($black, .15);
        &--animate
        {
            animation: changeMonth $slowDuration ease-in-out forwards;
        }
    }

    &__month {
        width: 100%;
        box-sizing: border-box;
        padding: 0 ($baseSize * 2);
        overflow: hidden;
        position: relative;
        &:after {
            content: '';
            width: 100%;
            height: 3em;
            border-radius: 10%;
            position: absolute;
            z-index: 3;
            bottom: -3em;
            left: 0;
            box-shadow: 0 -1em 1em -1em rgba($black, .6),
                        0 0 4em -1em rgba($black, .2);
        }
        &__day {
            display: inline-block;
            padding: ($baseSize / 2) 0;
            text-align: center;
            box-sizing: border-box;
            flex-basis: (100% / 7);
            background-image: radial-gradient($orange 50%, transparent 53%);
            background-size: 0 0;
            background-repeat: no-repeat;
            background-position: 50% 50%;
            transition: all $fastDuration $bezier;
            transition-delay: $fastDuration;
            time {
                display: inline-block;
            }
            &.today {
                color: $white;
                background-size: 3.5em 3.5em;
                @media (max-width: 40em) {
                    background-size: 3em 3em;
                }
            }
        }
        &__week {
            flex-wrap: wrap;
        }
    }
    &__controls {
        color: $white;
        &__button {
            padding: ($baseSize / 2) ($baseSize / 4);
            cursor: pointer;
            &__year {
                top: -.5em;
                position: relative;
                opacity: .6;
                font-size: .85em;
                padding-right: ($baseSize / 5);
            }
        }
    }
}
              
            
!

JS

              
                var date = new Date(),
    year = date.getFullYear(),
    month = date.getMonth(),
    yearCounter = year,
    monthCounter = month,
    calendarThead = document.getElementById('CALENDAR__THEAD'),
    calendarTbody = document.getElementById('CALENDAR__TBODY'),
    calendarControls = document.getElementById('CALENDAR__CONTROLS'),
    monthNames = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
    dayNames = ['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun'],
    formatMonth;

var getDaysInMonth = function(month, year) {
    return new Date(year, month + 1, 0).getDate();
};

function monthStartDay(thisYear, thisMonth) {
    var date = new Date(thisYear, thisMonth, 1);
    var startDay = date.getDay();

    if (startDay == 0) {
        startDay = 7;
    }

    return startDay;
}

function renderControls(target, year, month) {
    var controlLi = document.createElement('li'),
        prevBtn = document.createElementNS('http://www.w3.org/2000/svg', 'svg'),
        prevIcn = document.createElementNS('http://www.w3.org/2000/svg', 'use'),
        nextLi = document.createElement('li'),
        nextBtn = document.createElementNS('http://www.w3.org/2000/svg', 'svg'),
        nextIcn = document.createElementNS('http://www.w3.org/2000/svg', 'use'),
        todayBtn = document.createElementNS('http://www.w3.org/2000/svg', 'svg'),
        todayIcn = document.createElementNS('http://www.w3.org/2000/svg', 'use'),
        titleLi = document.createElement('li'),
        heading = document.createElement('header'),
        title = document.createElement('h3');

    prevIcn.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href', '#arrow');
    nextIcn.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href', '#arrow');
    todayIcn.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href', '#dot');

    titleLi.setAttribute('class', 'flexy__child');

    prevBtn.setAttribute('id', 'CALENDAR__CONTROLS__PREV');
    nextBtn.setAttribute('id', 'CALENDAR__CONTROLS__NEXT');

    controlLi.setAttribute('class', 'flexy__item flexy--items-center');
    nextLi.setAttribute('class', 'flexy__item flexy--items-center');

    prevBtn.setAttribute('class', 'calendar__controls__button svg-icon fill--white');
    todayBtn.setAttribute('class', 'calendar__controls__button svg-icon stroke--white');
    nextBtn.setAttribute('class', 'calendar__controls__button svg-icon fill--white svg-icon--rotated-180');

    prevBtn.appendChild(prevIcn);
    nextBtn.appendChild(nextIcn);
    todayBtn.appendChild(todayIcn);
    controlLi.appendChild(prevBtn);
    controlLi.appendChild(todayBtn);
    controlLi.appendChild(nextBtn);

    // title.innerHTML = monthNames[month];
    title.innerHTML = '<span class="calendar__controls__button__year">' + year + ' .</span>' + monthNames[month];
    heading.appendChild(title);
    titleLi.appendChild(heading);

    target.appendChild(titleLi);
    target.appendChild(controlLi);

    prevBtn.addEventListener('click', changeMonth);
    nextBtn.addEventListener('click', changeMonth);
    todayBtn.addEventListener('click', goToday);
}

function renderDayNames(namesArray) {
    var namesRow = document.createElement('tr');

    namesRow.setAttribute('class', 'calendar__month__week flexy__item');

    for (var i = 0; i < namesArray.length; i++) {
        var thDay = document.createElement('th');
        thDay.setAttribute('class', 'calendar__month__day');
        thDay.innerHTML = namesArray[i];
        namesRow.appendChild(thDay);
    }

    calendarThead.appendChild(namesRow);
}

renderDayNames(dayNames);

function goToday() {
    calendarTbody.setAttribute('class', 'calendar__tbody calendar__tbody--animate');
    setTimeout(function(){
        newMonth(year, month);
    }, 450);
    setTimeout(function(){
        calendarTbody.setAttribute('class', 'calendar__tbody');
    }, 900);
    yearCounter = year;
    monthCounter = month;
}

function changeMonth() {
    if (this.id.split('NEXT').length > 1) {
        if (monthCounter < 11) {
            monthCounter++;
        } else {
            monthCounter = 0;
            yearCounter++;
        }
    } else if (this.id.split('PREV').length > 1) {
        if (monthCounter > 0) {
            monthCounter--;
        } else {
            monthCounter = 11;
            yearCounter--;
        }
    }
    calendarTbody.setAttribute('class', 'calendar__tbody calendar__tbody--animate');
    setTimeout(function(){
        newMonth(yearCounter, monthCounter);
    }, 450);
    setTimeout(function(){
        calendarTbody.setAttribute('class', 'calendar__tbody');
    }, 900);
}

function renderMonth(thisYear, thisMonth) {
    var days = getDaysInMonth(thisMonth, thisYear),
        startDay = monthStartDay(thisYear, thisMonth),
        monthRow = document.createElement('tr');
    monthRow.setAttribute('id', 'CALENDAR__ROW');
    monthRow.setAttribute('class', 'calendar__month__week flexy__item');
    for (var i = 1; i < (days + startDay); i++) {
        var cellDay = document.createElement('td'),
            timeTag = document.createElement('time');
        cellDay.setAttribute('class', 'calendar__month__day');
        if (i >= startDay) {
            if (thisMonth < 10) {
                formatMonth = '0' + thisMonth;
            }
            timeTag.setAttribute('datetime', thisYear + '-' + formatMonth + '-' + (i - startDay));
            cellDay.setAttribute('id', 'CALENDAR__DAY--' + (i - startDay + 1));
            timeTag.innerHTML = i - startDay + 1;
            cellDay.appendChild(timeTag);
        } else {
            cellDay.innerHTML = '-';
        }
        monthRow.appendChild(cellDay);
    }

    calendarTbody.appendChild(monthRow);
    renderControls(calendarControls, thisYear, thisMonth);

    var today = document.getElementById('CALENDAR__DAY--' + date.getDate());

    if (thisMonth === date.getMonth() && thisYear === date.getFullYear()) {
        setTimeout(function() {
            today.setAttribute('class', 'calendar__month__day today');
        }, 200);
    }
}

function newMonth(year, month) {
    var controls = document.getElementById('CALENDAR__CONTROLS'),
        row = document.getElementById('CALENDAR__ROW');

    while (controls.firstChild) {
        controls.removeChild(controls.firstChild);
    }

    calendarTbody.removeChild(row);
    renderMonth(year, month);
}
renderMonth(year, month);

              
            
!
999px

Console