Question

29

Show week number with Javascript?

rated 0 times [ 33] [ 4] / answers: 1 / hits: 127470 / 13 Years ago, fri, october 14, 2011, 12:00:00

I have the following code that is used to show the name of the current day, followed by a set phrase.

<script type=text/javascript> 

    <!-- 

    // Array of day names

    var dayNames = new Array(

    It's Sunday, the weekend is nearly over,

    Yay! Another Monday,

     Hello Tuesday, at least you're not Monday,

     It's Wednesday. Halfway through the week already,

     It's Thursday.,

     It's Friday - Hurray for the weekend,

    Saturday Night Fever);

    var now = new Date();

    document.write(dayNames[now.getDay()] + .);

     // -->

</script>

What I would like to do is have the current week number in brackets after the phrase. I have found the following code:

Date.prototype.getWeek = function() {

    var onejan = new Date(this.getFullYear(),0,1);

    return Math.ceil((((this - onejan) / 86400000) + onejan.getDay()+1)/7);

}

Which was taken from http://javascript.about.com/library/blweekyear.htm but I have no idea how to add it to existing javascript code.

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leilanichasel

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2 Years ago

answered 13 Years ago rocioblancac · Accepted Answer

Simply add it to your current code, then call (new Date()).getWeek()

<script>

    Date.prototype.getWeek = function() {

        var onejan = new Date(this.getFullYear(), 0, 1);

        return Math.ceil((((this - onejan) / 86400000) + onejan.getDay() + 1) / 7);

    }



    var weekNumber = (new Date()).getWeek();



    var dayNames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];

    var now = new Date();

    document.write(dayNames[now.getDay()] +  ( + weekNumber + ).);

</script>