JavaScript—An Object Based Language - Beginning JavaScript - page 139

and for the third and twenty‐third days, you have this:

case 3:
case 23:
daySuffix = "rd";
break;

Finally, you need the default case for everything else. As you will have guessed by now, this is simply "th" :

default:
daySuffix = "th";
break;
}

In the final lines you simply write the information to the HTML page, using document.write() .

Setting Date Values
To change part of the date in a Date object, you have a group of set functions, which pretty much
replicate the get functions described earlier, except that you are setting, not getting, the values.
These functions are summarized in the following table:

method desCription

setDate() The date of the month is passed in as the

parameter to set the date.

setMonth() The month of the year is passed in as an integer

parameter, where 0 is January, 1 is February, and
so on.

setFullYear() This sets the year to the four‐digit integer number

passed in as a parameter.

Note Note that for security reasons, there is no way for web‐based
JavaScript to change the current date and time on a user's computer.

So, to change the year to 2016, the code would be as follows:

myDateObject.setFullYear(2016);

Setting the date and month to the 27th of February looks like this:

myDateObject.setDate(27);
myDateObject.setMonth(1);

One minor point to note here is that there is no direct equivalent of the getDay() method. After the
year, date, and month have been defined, the day is automatically set for you.