[Rise]

Блондинка,
Элита делает так (календарь):

Date.prototype.reduce = function(callback, value) {
    var year = this.getFullYear();
    var month = this.getMonth();
    var step = new Date(year, month, 1);
    var last = new Date(year, month + 1, 0);
    step.setHours(24 * (0 - (step.getDay() + 6) % 7));
    last.setHours(24 * (6 - (last.getDay() + 6) % 7));
    for (var i = 0; step <= last; i++) {
        value = callback(value, new Date(+step), i, this);
        step.setHours(24);
    }
    return value;
};

var test = new Date();
var text = test.reduce(function(value, current, index, source) {
    return value + current.getDate() + (current.getDay() ? '\t' : '\n');
}, 'Пн\tВт\tСр\tЧт\tПт\tСб\tВс\n');

console.log(text);