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POLabor Day Vs. Thanksgiving
 

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  1. POLabor Day Vs. Thanksgiving
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    <p>I am creating a calendar table for my warehouse. I will use this as a foreign key for all the date fields.</p> <p>The code shown below creates the table and populates it. I was able to figure out how to find Memorial Day (last Monday of May) and Labor Day (first Monday of September). </p> <pre><code>SET NOCOUNT ON DROP Table dbo.Calendar GO Create Table dbo.Calendar ( CalendarId Integer NOT NULL, DateValue Date NOT NULL, DayNumberOfWeek Integer NOT NULL, NameOfDay VarChar (10) NOT NULL, NameOfMonth VarChar (10) NOT NULL, WeekOfYear Integer NOT NULL, JulianDay Integer NOT NULL, USAIsBankHoliday Bit NOT NULL, USADayName VarChar (100) NULL, ) ALTER TABLE dbo.Calendar ADD CONSTRAINT DF_Calendar_USAIsBankHoliday DEFAULT 0 FOR USAIsBankHoliday GO ALTER TABLE dbo.Calendar ADD CONSTRAINT DF_Calendar_USADayName DEFAULT '' FOR USADayName GO Declare @StartDate DateTime = '01/01/2000' Declare @EndDate DateTime = '01/01/2020' While @StartDate &lt; @EndDate Begin INSERT INTO dbo.Calendar ( CalendarId, DateValue, WeekOfYear, DayNumberOfWeek, NameOfDay, NameOfMonth, JulianDay ) Values ( YEAR (@StartDate) * 10000 + MONTH (@StartDate) * 100 + Day (@StartDate), --CalendarId @StartDate, -- DateValue DATEPART (ww, @StartDate), -- WeekOfYear DATEPART (dw, @StartDate), -- DayNumberOfWeek DATENAME (dw, @StartDate), -- NameOfDay DATENAME (M, @StartDate), -- NameOfMonth DATEPART (dy, @StartDate) -- JulianDay ) Set @StartDate += 1 End --=========================== Weekends -- saturday and sunday UPDATE dbo.Calendar SET USAIsBankHoliday = 1, USADayName += 'Weekend, ' WHERE DayNumberOfWeek IN (1, 7) --=========================== Bank Holidays -- new years day UPDATE dbo.Calendar SET USAIsBankHoliday = 1, USADayName += 'New Year''s Day, ' WHERE (CalendarId % 2000) IN (101) -- memorial day (last Monday in May) UPDATE dbo.Calendar SET USAIsBankHoliday = 1, USADayName += 'Memorial Day, ' WHERE 1=1 AND CalendarId IN ( SELECT MAX (CalendarId) FROM dbo.Calendar WHERE MONTH (DateValue) = 5 AND DATEPART (DW, DateValue)=2 GROUP BY YEAR (datevalue) ) -- independence day UPDATE dbo.Calendar SET USAIsBankHoliday = 1, USADayName += 'Independence Day, ' WHERE (CalendarId % 2000) IN (704) -- labor day (first Monday in September) UPDATE dbo.Calendar SET USAIsBankHoliday = 1, USADayName += 'Labor Day, ' WHERE 1=1 AND CalendarId IN ( SELECT MIN (CalendarId) FROM dbo.Calendar WHERE MONTH (DateValue) = 9 AND DATEPART (DW, DateValue)=2 GROUP BY YEAR (datevalue) ) -- thanksgiving day (fourth Thursday in November) UPDATE dbo.Calendar SET USAIsBankHoliday = 1, USADayName += 'Thanksgiving Day, ' WHERE 1=1 AND CalendarId IN ( SELECT Max (CalendarId) FROM dbo.Calendar WHERE MONTH (DateValue) = 11 AND DATEPART (DW, DateValue)=5 GROUP BY YEAR (datevalue) ) -- christmas UPDATE dbo.Calendar SET USAIsBankHoliday = 1, USADayName += 'Christmas Day, ' WHERE (CalendarId % 2000) IN (1225) --=========================== Other named days -- new years eve UPDATE dbo.Calendar SET USADayName += 'New Year''s Eve, ' WHERE (CalendarId % 2000) IN (1231) -- christmas eve UPDATE dbo.Calendar SET USADayName += 'Christmas Eve, ' WHERE (CalendarId % 2000) IN (1224) -- boxing day UPDATE dbo.Calendar SET USADayName += 'Boxing Day, ' WHERE (CalendarId % 2000) IN (1226) --=========================== Remove trailing comma UPDATE dbo.Calendar SET USADayName = SubString (USADayName, 1, LEN (USADayName) -1) WHERE LEN (USADayName) &gt; 2 SELECT * FROM dbo.Calendar </code></pre> <p>I am stumped on figuring out Thanksgiving day (Thursday of the last FULL week of November).</p> <p><strong>Edit:</strong> Correction based on comment by <strong>John Sauer</strong></p> <p>Thanksgiving is the fourth Thursday of November. However, upon checking several years, I find that it has turned out to also be the Thursday of the last full week of Nov.</p>
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    1. COLeave it out. Makes the turkeys happy.
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    2. COThe start of Ramadan is also challenging.
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    3. COAnd then, there's Good Friday and Easter...
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