convert ms sql datetime 2000 to a PHP / UNIX time stamp

I found this function on the web but being in the UK it doesn' t convert the time correctly

for example

Expr1      SLAContract_StartDate      Expr1      SLAContract_EndDate
1246406400      01/07/2009      1277942399      30/06/2010 23:59:59
1243814400      01/06/2009      1269993600      31/03/2010

should be according to our own php checker
Date String timestamp: 1277938799
Date String timestamp check: 30/06/2010 11:59pm

but if I put 1277942399 it converts to the next day
Timestamp date: 01/07/2010 00:59:59

we are in England UK London

IF @dt >= 203801192
SET @diff = CONVERT(BIGINT, DATEDIFF(S, 197001012, 203801192))
+ CONVERT(BIGINT, DATEDIFF(S, 203801192, @dt))
SET @diff = DATEDIFF(S, 197001012, @dt)
RETURN @diff

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Chris MichalczukConsultantAsked:
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Mark WillsTopic AdvisorCommented:
Here you go... you looked in the wrong place, has been here all along :)

Expr1      SLAContract_StartDate      Expr1      SLAContract_EndDate
1246406400      01/07/2009      1277942399      30/06/2010 23:59:59
1243814400      01/06/2009      1269993600      31/03/2010
-- sample usage. Either param1 = date or param2 = unix , param3 = units (some unix times are in milliseconds)
-- e.g. unix date to normal sql date
select dbo.uUnixDate(NULL,1277942399,1)
-- e.g. normal date to unix
select dbo.uUnixDate('20090601',NULL,1)
-- now the function :
create function uUnixDate(@dt datetime,@unix bigint,@uom int)
returns varchar(30)
if @unix is NULL return convert(varchar,convert(bigint,((convert(decimal(36,18),@dt) - 25567) * 60 * 60 * 24 * @uom)))
if @dt is NULL return replace(convert(varchar,convert(datetime,((@unix / (@uom * 60.0 * 60.0 * 24.0)) + 25567)),121),'-','')
return NULL

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Microsoft SQL Server 2005

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