Happy 2011 in 63 bases

JavaScript

// Convert decimal into a base between 2 and 64
// modified from http://stackoverflow.com/questions/656941/converting-decimals-to-sexagesimal-base-sixty-in-javascript
var decToBase = function() {
    var decToBaseMap = [
        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'Y', 'Z',
        '+', '/'];

    return function(number, base) {

        if (base < 2 || base > 64) {
            return "#base should be between 2 and 64#";
        }

        var negative = '';
        if (number < 0) {
            negative = '-';
        }

        number = number.toString().split('.');
        var integer = Math.abs(number[0]);
        var fraction = number[1];
        var result = '';

        do {
            result = decToBaseMap[integer % base] + result;
            integer = parseInt(integer / base, 10);
        } while (integer > 0);

        if (fraction) {
            var decimalPlaces = fraction.toString().length;
            result += '.';
            fraction = parseFloat('.' + fraction);

            var x = 0;
            do {
                x++;
                var res = (fraction * base).toString().split('.');
                result = result + decToBaseMap[res[0]];

                if (res[1]) {
                    fraction = parseFloat('.' + res[1]);
                }
                else {
                    break;
                }
            } while (x < decimalPlaces);
        }
        return negative + result;
    };
}();

var num = 2018;
for (var base = 2; base <= 64; base++) {
    document.write("<div>Happy " + num + " or <span style=\"color: blue\">" + decToBase(num, base) + "</span> in base " + base + " !</div>");
}