codeigniter日历可以用2种不同的颜色设计吗？

I need to style a codeigniter calendar using the template provided in the user guide but I need that from day 1 to 15 from a given month be background-color red and from day 16 to the last day of the month to be blue.

Please someone help me with this. I am very grateful for everyone's help.

You can use the Creating a Calendar Template here: http://www.codeigniter.com/userguide2/libraries/calendar.html

or you can also use the CSS3 :nth-child() Selector

example:

p:nth-child(2) {
    background: #ff0000;
}

in the example above you specify a background color for every <p> element that is the second child of its parent: