Rekar

var td = $('#timeGrid td'),
    selection = {
        single: function(el) {
            td.not(el).removeClass(this.cl);
            this.ctrl(el);
        },
        shift: function(el) {
            if (typeof this.last !== 'number') {
                return this.single(el);
            }
            var till = $(el).index(this.slcr),
                from = this.last;
            if (from > till) till = [from, from = till][0];
            td.not(td.eq(this.last)).removeClass(this.cl);
            td.slice(from, till).add(el).addClass(this.cl);
        },
        ctrl: function(el) {
            $(el).addClass(this.cl);
            this.last = $(el).index(this.slcr);
            console.log(this.last);
        },
        slcr: '#timeGrid td',
        cl: 'pressedTime',
        last: null
    };
td.on('click', function(e) {
    method = !e.shiftKey && !e.ctrlKey ? 'single' : (e.shiftKey ? 'shift' : 'ctrl');
    selection[method](this);
});

var table = $('#timeGrid'),
    td = $('td', table),
    selection = {
        single: function(el) {
            td.not(el).removeClass(this.cl);
            this.ctrl(el);
        },
        shift: function(el) {
            if (typeof this.last !== 'number') {
                return this.single(el);
            }
            var till = $(el).index(this.slcr),
                from = this.last;
            if (from > till) till = [from, from = till][0];
            td.not(td.eq(this.last)).removeClass(this.cl);
            td.slice(from, till).add(el).addClass(this.cl);
        },
        ctrl: function(el) {
            $(el).addClass(this.cl);
            this.last = $(el).index(this.slcr);
        },
        slcr: '#timeGrid td',
        cl: 'pressedTime',
        last: null
    };
var pressed = false;
td.on({
    mousedown: function(e) {
        method = !e.shiftKey && !e.ctrlKey ? 'single' : (e.shiftKey ? 'shift' : 'ctrl');
        selection[method](this);
        pressed = true;
    },
    mouseenter: function() {
        if (pressed) {
            selection.shift(this);
        }
    }
});
$(document).on('mouseup', '*', function(e) {
    pressed = false;
});