Joomla! calendar + UIKIT 3

gistfile1.js

jQuery(document).ready(function () {
    // calendar
    uikit_jcalendar();

    // button
    uikit_jcalendar_btn('#news_created_btn', 'uk-button-primary', 'calendar');
    uikit_jcalendar_btn('#news_publish_up_btn', 'uk-button-secondary', 'future');
});

// calendar
function uikit_jcalendar()
{
    jQuery('.js-calendar .table').removeClass('table').addClass('uk-table');
    jQuery('.js-calendar .daysrow, .js-calendar .day').addClass('uk-text-large');
    jQuery('.js-calendar select.time').addClass('uk-select');
    jQuery('.js-calendar .btn-group .js-btn').addClass('uk-width-1-3 uk-button uk-button-default uk-padding-remove-top uk-padding-remove-bottom uk-padding-small');
    jQuery('.js-calendar .btn-group').removeClass('btn-group').addClass('uk-button-group');
}

// button
function uikit_jcalendar_btn(trigger, tm_button, tm_icon)
{
    jQuery(trigger).addClass('uk-button uk-button-small '+ tm_button);
    jQuery(trigger +' span').append('<i uk-icon="icon: '+ tm_icon +'"></i>');
}

Before:

After: