Funny DateTime Issues

Hello this is weird when I run this on a Friday
SELECT DATENAME(dw,5) --> returns 'Saturday'
Select DATEPART(dw,GETDATE()) --> returns 5
Can anyone explain why this would occur?Check your @.@.DATEFIRST value. It might be set to 1 ( Monday ). You can
change it using SET DATEFIRST statement.
Anith|||I think the problem in the first query is that sql see the number that you
pass as the day of the month or a Julian date. The value of the second
parameter to DATENAME should be a valid date. If you run SELECT DATENAME(dw,
GETDATE()) then you will get "Friday". The second query you have returns the
wday number. For example Sunday = 1...Saturday = 7. That can be changed
by SET DATEFIRST. But by default 5 is the wday number for Friday.
Hope that helps
Tim
"Anith Sen" <anith@.bizdatasolutions.com> wrote in message
news:ewb3BkG7FHA.2628@.TK2MSFTNGP11.phx.gbl...
> Check your @.@.DATEFIRST value. It might be set to 1 ( Monday ). You can
> change it using SET DATEFIRST statement.
> --
> Anith
>|||The second parameter for DATENAME is a date - this call is getting the
day of the w for 1900-01-06, which is a Saturday. The implicit
conversion is based on 0=1900-01-01, ergo 5=1900-01-06.
As Anith has said, DATEPART is dependent on DATEFIRST, which is probably
set to Monday in your system.
yurps wrote:
> Hello this is weird when I run this on a Friday
> SELECT DATENAME(dw,5) --> returns 'Saturday'
> Select DATEPART(dw,GETDATE()) --> returns 5
> Can anyone explain why this would occur?
>|||Ok, if this is the case, try this out and explain why it works
set datefirst 1
declare @.bd datetime
select @.bd = '2005-12-01 00:00:00';
with dd (FullDateAlternateKey,
DayNumberOfW,HourNumber,EnglishDayNam
eOfW)
as
(
select @.bd,datepart(dw,@.bd),datepart(hh,@.bd),da
tename(dw,@.bd)
union all
select dateadd(hh,1,FullDateAlternateKey)
,datepart(dw,dateadd(hh,1,FullDateAltern
ateKey))
,datepart(hh,dateadd(hh,1,FullDateAltern
ateKey))
,datename(dw,day(dateadd(dw,2,dateadd(hh
,1,FullDateAlternateKey))))
from dd
where FullDateAlternateKey<='2005-12-31'
)
select * from dd
option (maxrecursion 0)
You will notice that I have added a dateadd(dw,2,...) in the recursive part.
Try pulling it out you will find (at least that is what happens in my
system) that the day returned is two days back from the actual day.
Am I doing something wrong?
"Trey Walpole" wrote:

> The second parameter for DATENAME is a date - this call is getting the
> day of the w for 1900-01-06, which is a Saturday. The implicit
> conversion is based on 0=1900-01-01, ergo 5=1900-01-06.
> As Anith has said, DATEPART is dependent on DATEFIRST, which is probably
> set to Monday in your system.
> yurps wrote:
>