Trying to build a solution to account for paid holidays that won't have to be updated every year

Here is the script I have been using to calculate which pay period to add holiday hours to and how many hours to add:

If [Truncate(WeekOfYear(Time Cards::Begin Week)/2;0) = "26"]
     Set Field [Time Cards::Paid Holidays; "8:00"]
Else If [Truncate(WeekOfYear(Time Cards::Begin Week)/2;0) = "7"]
     Set Field[Time Cards::Paid Holidays; "8:00"]
Else If [Truncate(WeekOfYear(Time Cards::Begin Week)/2;0) = "11"]
     Set Field [Time Cards::Paid Holidays; "8:00"]
Else If [Truncate(WeekOfYear(Time Cards::Begin Week)/2;0) = "13"]
     Set Field [Time Cards::Paid Holidays; "8:00"]
Else If [Truncate(WeekOfYear(Time Cards::Begin Week)/2;0) = "18"]
     Set Field [Time Cards::Paid Holidays; "8:00"]
Else If [Truncate(WeekOfYear(Time Cards::Begin Week)/2;0) = "23"]
     Set Field [Time Cards::Paid Holidays; "16:00"]
Else If [Truncate(WeekOfYear(Time Cards::Begin Week)/2;0) = "25"]
     Set Field [Time Cards::Paid Holidays; "16:00"]
Else
     Set Field [Time Cards::Paid Holidays; "0:00"]
End If

The problem is that I have to recalculate which week of the year the holidays fall and change this script every year.
ARuleAsked:
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North2AlaskaCommented:
Put this information in a table and drive any calculations from it.  This allows you the most flexibility as you can delete, add and change dates as you see fit.
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Will LovingPresidentCommented:
To use a calculation which determines the date of each holiday for a given year, along with the week that it falls in that year. I've done something similar for a calendaring system which calculates specific dates that a school is closed. Some dates are easy, for instance July 4 or New Years Day because they always fall on a known date. Other holidays are trickier, such as Thanksgiving and Presidents Day. Easter and the Jewish Holidays are really interesting because they rely in part on a lunar based system.

For all of these I recommend checking out the custom Functions for calculating holidays at http://www.briandunning.com/filemaker-custom-functions/  - just search on the word "holiday". You will need FileMaker Advanced to actually install the Custom Functions, but you can use the calculations directly if you wish. If you setup a calculation for the various holidays you can use a Global field for the year and just update the Year field annually.
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ARuleAuthor Commented:
Awesome... thanks!

I am creating the calculations in a separate table "holidays" and made the field yearNumber=Year(Get(currentDate))

If I change my open script to create a new record in this table everytime a new timecard is created, I should not have to worry about even updating the year field annually, correct?
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North2AlaskaCommented:
I took a look at the custom functions (and there are some good ones) but it seems they all want a list of holiday dates as one of the parameters.  While a single field with all the holiday dates would work, I still would put them in a table and pass them to the functions using the List ( Holidays::Date ) function.

I've been using a "Calendar" table for a few years now.  In this table I have all Dates and a break down of that date (Day in year, Week in year, month in year, quarter, day of week, etc...  and if you use a fiscal calendar it really starts to pay off.  In all there are about 50+ fields in my table that relate to a specific date. I currently have about a hundred years of dates to choose from. )  One of the fields is Holiday_Flag.  I can set the flag and now every holiday can be listed.

I found a great article about building and using a Calendar table.  It's focused around SQL Server, but hopefully it will make some sense to you.  
http://sqlserver2000.databases.aspfaq.com/why-should-i-consider-using-an-auxiliary-calendar-table.html
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