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Thursdays in a year excluding Christmas and New Years 1

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THWatson

Technical User
Apr 25, 2000
2,601
CA
Using Access 2000

A club meets every Thursday. If a member attends all 52 Thursdays in a given year, he/she receives Perfect Attendance credit for that year. So, calculating whether or not the member achieved perfect attendance for a given year is relatively easy - compare the # of meetings attended to the number of weeks in that year.

However, in certain years (e.g. 2008) both Christmas and New Years days fell on Thursday. In those years, a member receives Perfect Attendance credit if she/he attended 50 meetings that year.

Is there a formula or function that calculates the number of Thursdays in a year excluding holidays?

Thanks.

Tom
 
How about keeping a small table of holidays and deducting one from 52 for each holiday that occurs on Thursday? I have some code for calculating Easter, if that holiday is relevant.

 
Remou
Thanks for the suggestion.

Let me take a run at that approach. I guess that the table would only need to have 12/25 and 1/1 in it.

Since Easter would never fall on a Thursday, the Easter holiday wouldn't be relevant. Unless I'm missing something in my thinking.
However, could you post the Easter calculation code, because I might be able to use it elsewhere.

Thanks.

Tom
 
Remou
Where I am - Canada - although we celebrate St. Patrick's Day it is not a holiday (at least not a statutory holiday) and I don't know of anyone who has a holiday from work on that day. There are 8 Federal statutory holidays, and then some provinces have additional statutory holidays (e.g. where I am - Ontario - we have one additional, making a total of 9).

When I think of Easter, I think of Easter Sunday. Good Friday is a statutory holiday, but since that's not a Thursday...

We don't refer to St. Stephen's Day here - which, if I'm not mistaken, falls on December 26. But we do have Boxing Day which is December 26, and that is a statutory holiday.
All of which makes me ask whether or not the club meets on Thursday if Boxing Day falls on a Thursday. If so, that would mean there would be 51 meeting days in that year.
I will have to inquire about that.

In any event, thanks for the formula, and for the link.

Much appreciated.

Tom
 
However, in certain years (e.g. 2008) both Christmas and New Years days fell on Thursday
On my calendar:

Jan 1, 2008 -- Tuesday
Dec 25, 2008 -- Thursday

Jan 1, 2009 -- Thursday
Dec 25, 2009 -- Friday


Randy
 
randy700

[blush] I was think of the New Year following Christmas, that ism next year.

Code:
WeekCount = IIf(Weekday(DateSerial(Year(Date), 12, 25)) = 5 _
And Weekday(DateSerial(Year(Date), 1, 1)) = 5, 50, _
IIf(Weekday(DateSerial(Year(Date), 12, 25)) = 5 _
Or Weekday(DateSerial(Year(Date), 1, 1)) = 5, 51, 52))

 
Randy
Right. However, in this particular case, the fiscal year for the club runs from October through September. (and I should have indicated that before)

That would seem to indicate that the formula is correct as is. Or am I missing something?

Tom
 
If the weeks in question are Christmas of a year and New Year of the next year, then the first example is correct as there are seven days between the two.

 
Well, Alice, this thing gets curiouser and curiouser!"

Upon finding further information, turns out that a club member is granted Perfect Attendance for attending the appropriate number of meetings (could be 52, could be 50, depending on the cycle of his/her year being used) in any consecutive 12 month period.

So, I can't calculate from any specific data in time because Member A may be working on a different cycle from Member B, and each of those different from Member C, etc. on through all the members. Sounds like enough to give a fella nightmares.

Providing one had a Start Date for the cycle, a running total could be kept...but how the heck do you program in a start date when it's different for every member?

Any thoughts would be appreciated.

Thanks.

Tom
 
I modified the code a bit, in order to allow the user to select the dates for a period from a form.

The code is
Code:
WeekCount: IIf(Weekday(DateSerial(Year([Forms]![frmDateSelector]![txtStartDate]),12,25))=5 And Weekday(DateSerial(Year([Forms]![frmDateSelector]![txtEndDate]),1,1))=5,50,IIf(Weekday(DateSerial(Year([Forms]![frmDateSelector]![txtStartDate]),12,25))=5 Or Weekday(DateSerial(Year([Forms]![frmDateSelector]![txtEndDate]),1,1))=5,51,52))

That shows the number of Thursdays in a YEAR's time, excluding Christmas and New Years.

I would like also to be able to show the # of Thursdays within the selected time period, which could be less than a full year. The # of Thursdays would still exclude Christmas and New Years.

I have been working on the code for this, but haven't quite got it.

Tom
 
A custom function might be the best bet.

Code:
Function RetThur(dteStart, dteEnd)
Dim intT As Integer
Dim dteTest As Date

    If dteStart >= dteEnd Then
        'Problem
        RetThur = "Error"
    End If
    
    For i = 0 To (dteEnd - dteStart)
        dteTest = dteStart + i
        ny = DateSerial(Year(dteTest), 1, 1)
        xm = DateSerial(Year(dteTest), 12, 25)
        
        If Weekday(dteTest) = 5 And dteTest <> ny And dteTest <> xm Then
            intT = intT + 1
        End If
    Next
    
    RetThur = intT
    
End Function


 
Remou
I had to declare additional variables...
Dim i As Integer
Dim ny As Date
Dim xm As Date


But when I run the function, it doesn't seem to matter what dates I input I still get a value of 0.

e.g.
? RetThur(12/28/08,1/10/09) returns 0, whereas I think it should return 1
? RetThur(1/11/08,1/25/09) returns 0, whereas I think it should return 2

Unless I am not doing something correctly.

Tom
 
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