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Thread: Count number of Sunday from a given date to today

  1. #1
    Join Date
    Mar 2011
    Posts
    3

    Count number of Sunday from a given date to today

    Hello

    New to the forum and hoping someone can help.
    I was familiar with JS but that was many years ago, and I guess the brain cells that held that info have retired.

    Does anyone have a way of counting the number of Sundays from a given date to todays date?

    For example the given date is 11/27/2010, so how many Sundays from then til today?

    Any help would be greatly appreciated.

    George

  2. #2
    Join Date
    Dec 2003
    Location
    Bucharest, ROMANIA
    Posts
    15,428
    Could be something like this:
    Code:
    <script type="text/javascript">
    // Start extended prototype
    Date.prototype.countDays=function(YYYY,MM,DD,D){
    var thisDate=new Date(this.getFullYear(),this.getMonth(),this.getDate())
    var otherDate=new Date(Number(YYYY),Number(MM)-1,Number(DD))
    var startD, endD, howmany=0;
    if(thisDate>otherDate){
    startD=otherDate;
    endD=thisDate;
    }
    else{
    startD=thisDate;
    endD=otherDate;
    }
    while(endD>=startD){
    	if(startD.getDay()==D){howmany++}
    	startD.setDate(startD.getDate()+1);
    }
    this.howmany=howmany;
    }
    // End extended prototype
    
    var today=new Date();
    today.countDays(2010,11,27,0); // Year,Month,Date,Week's Day (0=Sunday, 1=Monday...)
    alert(today.howmany);
    </script>

  3. #3
    Join Date
    Mar 2011
    Posts
    3
    Hey Kor,

    Thanks for the reply and code. As I metioned it has been some time since I did any scripting, so your coding is a bit advanced for me right now.

    I did fumble my way through and came up with this bit which counts the days, the Sundays, and the working days.

    It may not be pretty, but I did it and it works, and I understand it.

    Once again though, I appreciate your time and advice.

    Code:
    var gpldt = new Date();
      var gplmo = new Date();
      var gplyr = new Date();
    // GET TODAY DATE	****************
    	var  dt = gpldt.getDate();
    	var  mo = gplmo.getMonth();
    	var  yr = gplyr.getYear();
    //**********************************
      
     	var  sdt = "10"
    	var  smo = "0" 
    	var  syr = "2011"  
     
      var fullDay = 24*60*60*1000;
      var OT1Date =  new Date(syr,smo,sdt); 
      var todayDate = new Date(yr,mo,dt); 
      var difDay = Math.floor((todayDate.getTime() - OT1Date.getTime())/(fullDay)); 
      difDay = difDay + 1
      var difSun = Math.floor(difDay / 7)
      mo = mo+1
      var wrkdys = difDay - difSun;
    
    document.write("There are " + difDay + " days between " )
    document.write("Todays Date: " + mo+"/"+dt+"/"+yr +"  and the Start Date: 1/10/2011")
    document.write('<br />' )
    document.write("There are "+difSun+ " Sundays" )
    document.write('<br />' )
    document.write("There are " + wrkdys + " working days inc Saturdays")
    document.write('<br />' )

  4. #4
    Join Date
    Dec 2003
    Location
    Bucharest, ROMANIA
    Posts
    15,428
    Quote Originally Posted by bigGPL View Post
    I did fumble my way through and came up with this bit which counts the days, the Sundays, and the working days.

    It may not be pretty, but I did it and it works, and I understand it.
    Well, if it works, it works There are many ways to skin a cat

    Regarding my code, it is not a big deal. It is just a way to extend the prototype of a primitive. If you are interested, about the prototype property/object:

    http://www.w3schools.com/jsref/jsref_prototype_math.asp
    http://www.javascriptkit.com/javatutors/proto.shtml

    and about extending the native prototype of some Primitives:
    http://phrogz.net/js/classes/Extendi...ndClasses.html

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