How do I determine a public holiday in Sql server?

Question

I have an application written in c# that cannot run on a public holiday or a weekend. I\'ve looked around a bit and haven\'t found anywhere (official) that provides all the

Answer 1

I just gather information over the internet and I come with this easy way to calculate the US Bank Holidays.

---

US Bank Holidays

===========================

DECLARE @Year char(4)
, @Date datetime
, @Holiday datetime

SET @Year = 2010

---- New Years Day
SET @Date=CONVERT( datetime, CONVERT(varchar, YEAR( @Year ) )+'-01-01' ) 
IF DATENAME( dw, @Date ) = 'Saturday'
    SET @Date=@Date-1
ELSE IF DATENAME( dw, @Date ) = 'Sunday'
    SET @Date=@Date+1
SELECT @Date [New Years Day], DATENAME( dw, @Date ) [DayOfWeek]

---- Martin L King's Birthday ( 3rd Monday in January )
SET @Date = CONVERT( datetime, CONVERT(varchar, YEAR( @Year ) )+'-01-01' ) 
SET @Holiday = DATEADD( wk, DATEDIFF( wk, 0, dateadd( dd, 18-datepart( day, @Date ), @Date ) ), 0 ) -- 3rd Monday of the Month
SELECT @Holiday [Martin L King's Birthday], DATENAME( dw, @Holiday ) [DayOfWeek]

---- President’s Day ( 3rd Monday in February )
SET @Date = CONVERT( datetime, CONVERT(varchar, YEAR( @Year ) )+'-02-01' ) 
SET @Holiday = DATEADD( wk, DATEDIFF( wk, 0, dateadd( dd, 18-datepart( day, @Date ), @Date ) ), 0 ) -- 3rd Monday of the Month
SELECT @Holiday [President’s Day], DATENAME( dw, @Holiday ) [DayOfWeek]

---- Memorial Day ( Last Monday in May )
SET @Date = CONVERT( datetime, CONVERT(varchar, YEAR( @Year ) )+'-05-01' ) 
SET @Holiday = DATEADD( wk, DATEDIFF( wk, 0, dateadd( dd, 30-datepart( day, @Date ), @Date ) ), 0 ) -- 5th Monday of the Month
SELECT @Holiday [Memorial Day], DATENAME( dw, @Holiday ) [DayOfWeek]

---- Independence Day ( July 4 )
SET @Date=CONVERT( datetime, CONVERT(varchar, YEAR( @Year ) )+'-07-04' ) 
IF DATENAME( dw, @Date ) = 'Saturday'
    SET @Date=@Date-1
ELSE IF DATENAME( dw, @Date ) = 'Sunday'
    SET @Date=@Date+1
SELECT @Date [Independence Day], DATENAME( dw, @Date ) [DayOfWeek]

---- Labor Day ( 1st Monday in September )
SET @Date = CONVERT( datetime, CONVERT(varchar, YEAR( @Year ) )+'-09-01' ) 
SET @Holiday = DATEADD( wk, DATEDIFF( wk, 0, dateadd( dd, 6-datepart( day, @Date ), @Date ) ), 0 ) -- 1st Monday of the Month
SELECT @Holiday [Labor Day], DATENAME( dw, @Holiday ) [DayOfWeek]

---- Columbus Day ( 2nd Monday in October )
SET @Date = CONVERT( datetime, CONVERT(varchar, YEAR( @Year ) )+'-10-01' ) 
SET @Holiday = DATEADD( wk, DATEDIFF( wk, 0, dateadd( dd, 12-datepart( day, @Date ), @Date ) ), 0 ) -- 2nd Monday of the Month
SELECT @Holiday [Columbus Day], DATENAME( dw, @Holiday ) [DayOfWeek]

---- Veteran’s Day ( November 11 )
SET @Date=CONVERT( datetime, CONVERT(varchar, YEAR( @Year ) )+'-11-11' ) 
IF DATENAME( dw, @Date ) = 'Saturday'
    SET @Date=@Date-1
ELSE IF DATENAME( dw, @Date ) = 'Sunday'
    SET @Date=@Date+1
SELECT @Date [Veteran’s Day], DATENAME( dw, @Date ) [DayOfWeek]

---- Thanksgiving Day ( 4th Thursday in November )
SET @Date = CONVERT( datetime, CONVERT(varchar, YEAR( @Year ) )+'-11-04' ) 
SET @Holiday = DATEADD( wk, DATEDIFF( wk, 0, dateadd( dd, 22-datepart( day, @Date ), @Date ) ), 0 )+3 -- 4th Thursday of the Month
SELECT @Holiday [Thanksgiving Day], DATENAME( dw, @Holiday ) [DayOfWeek]

---- Christmas Day ( December 25 )
SET @Date=CONVERT( datetime, CONVERT(varchar, YEAR( @Year ) )+'-12-25' ) 
IF DATENAME( dw, @Date ) = 'Saturday'
    SET @Date=@Date-1
ELSE IF DATENAME( dw, @Date ) = 'Sunday'
    SET @Date=@Date+1
SELECT @Date [Christmas Day], DATENAME( dw, @Date ) [DayOfWeek]

---- New Years Eve Day
SET @Date=CONVERT( datetime, CONVERT(varchar, YEAR( @Year ) )+'-12-31' ) 
IF DATENAME( dw, @Date ) = 'Saturday'
    SET @Date=@Date-1
ELSE IF DATENAME( dw, @Date ) = 'Sunday'
    SET @Date=@Date+1
SELECT @Date [New Years Day], DATENAME( dw, @Date ) [DayOfWeek]

Answer 2

You are going to need to maintain a holiday table for this. For proper internationalization, you even need to maintain which days are weekend days for this since even that is not universal. Likewise, you might need to maintain holidays by locale so your program knows the users in London have the day off but the users in Turkey do not.

This should be completely configurable by the user. For all you know, the company owner's birthday might be a "standard" day off. Try to find that holiday on the web.

Lastly, you do not want to store 50 years worth of holiday data. It will only be inaccurate and potentially slow all your code down.

Answer 3

google calendar public hollydays Maybe you could retrive your country/region data with google Calendar web service.

Answer 4

In our applications we have it part of the user configuration. There is a place for users to set what they consider public/bank holidays for as far into the future as they want. For ease of use there is the ability to copy them by date from previous years. This also allows them to set 'custom' public holdays, perhaps a day that the company treats as a holiday but is not natioanlly official...

Programatically, however, there are absolutely no assumptions at all. It's effectively just a user maintained table of dates.

(This includes the UK because, as stated above, some holidays vary and are not set in stone, and sometimes there are special one-off days.)

Answer 5

There is a web service available for this --

http://www.holidaywebservice.com/Holidays/servicesAvailable_HolidayService.aspx

Answer 6

In some countries (i.e. in Poland) number of holidays deepens on Easter.

At the end of this post you can find a code to calculate eater date and few holidays that depends on it.

Non-movable holidays, that are i.e. January 1st, Christmas Holidays, Independence day etc. can be stored somewhere in table.

Bear in mind that in number countries you have regions/states that can have additional public holidays, but to calculate all holidays for your country or region should be possible.

In UK i.e. you have Bank holidays that have some rules you can use in your code. - First Monday of May - Last Monday of May - Last Monday of August etc.

Please check this link for more details http://en.wikipedia.org/wiki/Public_holidays_in_the_United_Kingdom

How to calculate Easter date in SQL:

http://www.smart.net/~mmontes/nature1876.html

http://ghiorzi.org/easterda.htm

declare @a int
declare @b int
declare @c int
declare @d int
declare @e int
declare @f int
declare @g int
declare @h int
declare @i int
declare @j int
declare @k int
declare @l int
declare @m int
declare @n int
declare @Year int
declare @Month int
declare @Day int
declare @EasterSunday datetime
declare @EasterMonday datetime
declare @Pentecost datetime
declare @CorpusChristi datetime

SET @Year = 2014

SET @a = @Year%19;
SET @b = @Year/100;
SET @c = @Year%100;
SET @d = @b/4;
SET @e = @b%4;
SET @f = @c/4;
SET @g = @c%4;


   SET @h = (@b + 8)/25;
   SET @i = (@b - @h + 1)/3;
   SET @j = (19*@a + @b -  @d - @i + 15) % 30;
   SET @k = (32 + 2*@e + 2*@f - @j - @g) % 7;
   SET @m = (@a + 11*@j + 22*@k) / 451;
   SET @n = @j + @k - 7*@m + 114;

   SET @Month = @n/31;
   SET @Day = (@n % 31) + 1;

--PRINT @Year
--PRINT @Month
--PRINT @Day

SET @EasterSunday = dateadd(month,((@Year-1900)*12)+@Month-1,@Day-1)
SET @EasterMonday = dateadd(day,1,@EasterSunday)
SET @Pentecost = dateadd(day,49,@EasterSunday)
SET @CorpusChristi = dateadd(day,60,@EasterSunday)


PRINT 'Easter Sunday: ' + CONVERT(VARCHAR, @EasterSunday,120) + ' [' + DATENAME(dw, @EasterSunday) + ']'
PRINT ''

PRINT 'Easter Monday: ' + CONVERT(VARCHAR, @EasterMonday,120) + ' [' + DATENAME(dw, @EasterMonday) + ']'
PRINT ''

PRINT 'Pentecost: ' + CONVERT(VARCHAR, @Pentecost,120) + ' [' + DATENAME(dw, @Pentecost) + ']'
PRINT ''

PRINT 'CorpusChristi: ' + CONVERT(VARCHAR, @CorpusChristi,120) + ' [' + DATENAME(dw, @CorpusChristi) + ']'
PRINT ''