Disable days on Pikaday instance

disable-days.js

var picker = new Pikaday({
    field: document.getElementById('datpicker'),
    minDate: moment().toDate(), // Today
    disableDayFn: function(date) {
        var currentDate, today, yearFromNow, dateFormat;

        // Set Date Format
        dateFormat = 'YYYY-MM-DD';

        // Create Moment Objects
        currentDate = moment(date);
        today = moment(new Date());

        // Disable today
        // Use Moment methods to check dates etc.
        if ( currentDate.format(dateFormat) == today.format(dateFormat) ) {
            return true;
        }

    }
});