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Date and time Tips and tricks

Last week day of month by djj55
Posted: 29 Jan 10

This will give the last day on the month that is a Monday through Friday.  This assumes the week is set to 1 for Sunday and 7 for Saturday.  This code is for outputting only one year at a time.

CODE

DECLARE
    @dateM DATETIME,   -- used to hold date to compare and output
    @intDW INT,        -- day of week
    @intJ INT,         -- loop control - month number
    @strD VARCHAR(10)  -- date as string

-- Start with the first month
SET @intJ = 1
-- While the month is less than 13 (Jan - Dec)
WHILE @intJ < 13
BEGIN
-- Create a string with the first day of month
--      this could be any day within the month
-- Notice that the code sets the year is 2010
    SET @strD = CAST(@intJ AS VARCHAR) + '/1/2010'
-- Get the last day of the month to be checked if weekday
    SET @dateM = DATEADD(month, DATEDIFF(month, 0, @strD) + 1, 0) - 1
-- Find the day of week
    SET @intDW = datepart(dw, @dateM)
-- If Sunday or Saturday subtrack one from date and check again
    WHILE @intDW = 1 OR @intDW = 7
    BEGIN
        SET @dateM = DATEADD(d, -1, @dateM)
        SET @intDW = DATEPART(dw, @dateM)
    END
-- This is where the data can be saved if needed
    PRINT CONVERT(VARCHAR(10), @dateM, 101)
-- Increment the month number
    SET @intJ = @intJ + 1
END
Thank you,
djj

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