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calculating business days

Posted on 2004-04-15
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Last Modified: 2008-03-17
Here is a complicates question. I need a way to calculate 45 business days from any day of the year. I am going to try to give an example.

Lets say today 5/15/2004 I need to find out what day the 45th business day lands on and it need to exclud holidays and weekend. any Idea where I can find an example like this.  
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Question by:eteran
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LVL 3

Expert Comment

by:int_20h
ID: 10838041
Holidays really depends on a company's holiday's calendar... Is this going to be provided as a file or something?
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Author Comment

by:eteran
ID: 10838067
no, It is to calculate contracts. \
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Author Comment

by:eteran
ID: 10838074
dates
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Expert Comment

by:COBOLdinosaur
ID: 10838104
Without a list of the official holidays in the jurisdiction where this is to be applied it is impossible to determine how many business days there are for any given period of time.  Also may we assume that business days are Monday through Friday?

Cd&
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Expert Comment

by:int_20h
ID: 10838142
A possible algorithm:
- subtract date2 from date1 (java.util.Date)
- get week number from date1 (GregorianCalendar)
- get week number from date2       "        "
- subtract week number date2 and week number date1 = # of weekends
- multiply # of weekend by 2 (Sat & Sun)
- based on a list of Holidays between the two dates, you can subtract:

  number of dates
- number of weekends * 2
- number of holidays
-------------------------------
== number of business days!

Hope this helps!
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LVL 12

Expert Comment

by:lil_puffball
ID: 10838150
How about this? Define your holidays in the array hday.

<script>
//define the holidays
var hday=new Array();
    hday[hday.length]="1-1";
    hday[hday.length]="12-25";
    hday[hday.length]="4-5#2";
    hday[hday.length]="4-1#2";

function calcDays(date,n,output){
  var newDate=date;
  for(i=1;i<=n;i++){
    newDate.setDate(date.getDate()+1);
    //check if weekend or holiday
    if(newDate.getDay()==6||newDate.getDay()==0||isHoliday(newDate)){i--;}
  }
  output.value=(newDate.getMonth()+1)+"/"+newDate.getDate()+"/"+newDate.getFullYear();
}
function isHoliday(date){
  var month,day,num;
  for(j=0;j<hday.length;j++){
    month=hday[j].split("-")[0];
    if(month!=date.getMonth()+1){continue;}
    day=hday[j].split("-")[1];
    if(day.indexOf("#")==-1){
      if(day==date.getDate()){return true;}
    }else{
      day=day.split("#");num=day[1];day=day[0];
      if(day!=date.getDay()){return;}
      if(parseInt(date.getDate()/7)+1==num){return true;}
    }
  }
  return false;
}
function setTheDate(date){
  date=date.split("/");
  return new Date(date[2],date[0]-1,date[1]);
}
</script>

<form>
<br>Date (MM/DD/YY format): <input type=text value="4/15/2004" name=date>
<br># of Business Days: <input type=text value=45 name=numDays>
<br><input type=button value=Calculate onclick="calcDays(setTheDate(this.form.date.value),this.form.numDays.value,this.form.newdate);">
<br>New Date: <input type=text name=newdate readonly>
</form>
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LVL 12

Expert Comment

by:lil_puffball
ID: 10838183
Here is the rules for defining holidays:

There are 2 possible formats:

1) Month - Day
2) Month - Weekday # Number

For example:

1) "1-1" would be January 1 (New Year's Day).

2) "4-5#2" would be the 2nd Friday in April. (Good Friday)

In this example, 4 means April. 5 means Friday. 2 means the 2nd Friday.

If you have any more questions feel free to ask. :)
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Author Comment

by:eteran
ID: 10838235
what does this exclude weekends
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LVL 12

Expert Comment

by:lil_puffball
ID: 10838276
This excludes weekends as well as any holidays you define.
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Author Comment

by:eteran
ID: 10838332
so I have to define all weekends
or it does it for you
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LVL 12

Expert Comment

by:lil_puffball
ID: 10838335
weekends are already incorporated into the code.
holidays must be defined by you.
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Author Comment

by:eteran
ID: 10838339
Sorry got it
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Author Comment

by:eteran
ID: 10838341
OKay great. Works like a charm
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Author Comment

by:eteran
ID: 10838344
Let me ask you something. How do I find the official bank holidays.
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Author Comment

by:eteran
ID: 10838383
What about if I put in the holidays and they land on a weekend will they cont them.
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Accepted Solution

by:
lil_puffball earned 500 total points
ID: 10838445
It doesn't matter.

Here is how the script works (well, a brief description at least):

It loops through for the amount of days specified.
Each time, the day increases by one.
It checks if the day is a weekend. If it is, then skip it.
It checks if the day is a holiday. If it is, then skip it.

So if you put the holiday on the weekend, it'll skip it anyways, since it sees that the day is a weekend.

As for the official bank holidays, it really depends on your region.

Here's a good site, just find your country:

http://www.national-holidays.com/

For united states, this is the page:

http://www.jours-feries.com/index_pays.php3?id_pays=60&id_langue=2
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LVL 12

Expert Comment

by:lil_puffball
ID: 10838785
THanks for the points and the A. :)
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