Creating Holidays and Special Dates

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Creating Holidays and Special Dates

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terrance.steadman

Posted Tuesday, August 03, 2010 8:37 PM

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Comments posted to this topic are about the item Creating Holidays and Special Dates

Post #963205

Derek Dongray

Posted Wednesday, August 04, 2010 2:49 AM

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I needed a similar feature a few years ago and came up with 8 classifications of International holidays (non-working days) as either fixed or relative to some other date, one of which, I think, is unique to the UK. I handled holidays as single days and haven't checked if your multiple day code will cope with this. I assume it will!

The 8 are:
0 -- fixed date every year (MMDD)
1 -- days relative to Easter (e.g. Whitmonday is Easter Sunday + 50 days)
2 -- Fixed, but if it's at a weekend, it's replaced by the following Monday
3 -- Specific day of week, usually Moday of first (MM01) or last (MM25) week of a month, but could be e.g. Wednesday before MMDD
4 -- As 2, but for the 2nd day of a pair (e.g. Christmas/Boxing days in the UK)
5 -- fixed date in Hijri (Moslem) Calendar
6 -- days relative to Greek Orthodox Easter
7 -- relative to previous winter solstice (Chinese Qing Ming Jie)

The awkward item was 4, UK's Boxing Day holiday. Usually it's considered to be 26th December, but if it falls on a Saturday then it's replaced by havig the Monday (28th) as a holiday. However, if it falls on Sunday or Monday, then it's replaced by Tuesday (27/28th) because Christmas Day will be on Saturday/Sunday and hence will have triggered Monday already being a non-working day. So far, this is the only example I've found where a 2-day holiday gives 2 non-working days. Many countries assume that if a 'religious' holiday falls at a weekend, then no extra days are substituted.

I also collapsed the Easter calculation (for 1900 to 2099) into a single inline calculation (which needed a little tweaking):

when 1 -- days relative to Easter (e.g. Whitmonday is Easter Sunday + 50 days)
then
	dateadd(d,(case @year when 1954 then 14 when 1981 then 14 when 2049 then 14 when 2076 then 14 else 21 end
	 + ((19 * (@year % 19) + 24 ) % 30) + ((2 * (@year % 4) + 4 * (@year % 7) + 6 * ((19 * (@year % 19) +24 ) % 30) + 5) % 7))
	+[MonthDayOffset],convert(char(4),@year)+'0301')

I also used a single field as MonthDayOffset, i.e. it either contains a month & day (1225, 0704) or an offset (-2 for Good Friday, 2 days before Easter). This was simply because I could not see any point in a table having 2 columns where either one or the other but never both would be used.

Interesting to see how someone else solved a similar problem.

Derek

Post #963284

Jeff Moden

Posted Wednesday, August 04, 2010 6:10 AM

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I haven't done a deep dive on all the code but, if this works as advertised, it's an awesome solution for the problem stated. Thanks for taking the time to write it all up and sharing it, Terry.

--Jeff Moden

"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

For better, quicker answers on T-SQL questions, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537/

For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/

Post #963396

terrance.steadman

Posted Wednesday, August 04, 2010 6:15 AM

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Greetings Jeff,

It has been a project I have worked on for several years. I have translated the code several times from programming language to SQL backend to full SQL. Some parts may not be pretty but it should work for you. Smile

Terry Steadman

Post #963398

SQLRNNR

Posted Wednesday, August 04, 2010 10:45 AM

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Interesting solution. Thanks for sharing it with us.

Jason AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008

SQL RNNR

Posting Performance Based Questions - Gail Shaw
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Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp

Post #963625

Robert.Sterbal

Posted Wednesday, August 04, 2010 11:24 AM

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Nice code.

How is it licensed?

Post #963657

karyn.webb

Posted Wednesday, August 04, 2010 7:50 PM

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Beautiful! Thank you for that very elegant solution to something I've been hashing around with very badly. Smile

Post #963908

nbonadeu

Posted Thursday, August 05, 2010 8:02 AM

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Very nice solution. I use a solution like that.

I suggest to include region information in holiday table, because a world wide solution needs to know world, national e local holidays.

We need a solution that can inform international holidays, holidays of a country, holidays of a state and holidays of a city.

For example, a national company that has a solution for dealing with demands. A person can send a request for other peson in different cities. Each person has a certain amount of business days to answer a demand. If a person received a demand and he/she works in a city that has a local holiday, her/his deadline for responding it is different from another person in another city that hasn't a local holiday.

Best regards,

Nilson Bonadeu

Post #964283

terrance.steadman

Posted Thursday, August 05, 2010 8:23 AM

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Greetings Robert,

You are free to use the code to learn and your personal projects. If you are planning on using it in a commercial product that is to be sold, then I respectfully ask that you talk with me first.

Have a good day.

Terry Steadman

Post #964315

terrance.steadman

Posted Thursday, August 05, 2010 8:25 AM

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Greetings karyn,

Glad that you were able to find the code useful. If you have any questions, please don't hesitate to ask.

Have a good day.

Terry Steadman

Post #964320

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