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SQL- Start of month date function

i am currently using this to get the start of the day,
CAST(FLOOR(CAST(GETDATE() AS FLOAT))AS DATETIME)

what would i use to get the start of the month, also could you explain what the expression means, thank you
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meteorelec
Asked:
meteorelec
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1 Solution
 
contactkarthiCommented:
how about this one
 
CREATE FUNCTION [dbo].[ufn_GetFirstDayOfMonth] ( @pInputDate    DATETIME )
RETURNS DATETIME
BEGIN 
    RETURN CAST(CAST(YEAR(@pInputDate) AS VARCHAR(4)) + '/' + 
                CAST(MONTH(@pInputDate) AS VARCHAR(2)) + '/01' AS DATETIME) 
END
GO

Open in new window

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Patrick MatthewsCommented:
Hello meteorelec,

To get today, I like this better:

CONVERT(datetime, CONVERT(varchar, GETDATE(), 101))

1st of month:

CONVERT(datetime, CONVERT(varchar, DATEADD(d, 1 - DAY(GETDATE())), 101)

Regards,

Patrick
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meteorelecAuthor Commented:
Hi Patrick,

CONVERT(datetime, CONVERT(varchar, DATEADD(d, 1 - DAY(GETDATE())), 101)

is give me back

The dateadd function requires 3 argument(s)
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Patrick MatthewsCommented:
Sorry!

CONVERT(datetime, CONVERT(varchar, DATEADD(d, 1 - DAY(GETDATE()), GETDATE()), 101)
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meteorelecAuthor Commented:
Incorrect syntax near ')'.

is what i'm getting now
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Patrick MatthewsCommented:
CONVERT(datetime, CONVERT(varchar, DATEADD(d, 1 - DAY(GETDATE()), GETDATE()), 102))
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