SQL Server 2016 sürümü bu sorunu bir kez ve herkes için çözecektir . Daha önceki sürümler için bir CLR çözümü muhtemelen en kolay olanıdır. Veya belirli bir DST kuralı için (yalnızca ABD'de olduğu gibi), bir T-SQL işlevi nispeten basit olabilir.
Ancak, genel bir T-SQL çözümü mümkün olabileceğini düşünüyorum. Uzun Olarak xp_regread
eserleri, şunu deneyin:
CREATE TABLE #tztable (Value varchar(50), Data binary(56));
DECLARE @tzname varchar(150) = 'SYSTEM\CurrentControlSet\Control\TimeZoneInformation'
EXEC master.dbo.xp_regread 'HKEY_LOCAL_MACHINE', @tzname, 'TimeZoneKeyName', @tzname OUT;
SELECT @tzname = 'SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\' + @tzname
INSERT INTO #tztable
EXEC master.dbo.xp_regread 'HKEY_LOCAL_MACHINE', @tzname, 'TZI';
SELECT -- See http://msdn.microsoft.com/ms725481
CAST(CAST(REVERSE(SUBSTRING(Data, 1, 4)) AS binary(4)) AS int) AS BiasMinutes, -- UTC = local + bias: > 0 in US, < 0 in Europe!
CAST(CAST(REVERSE(SUBSTRING(Data, 5, 4)) AS binary(4)) AS int) AS ExtraBias_Std, -- 0 for most timezones
CAST(CAST(REVERSE(SUBSTRING(Data, 9, 4)) AS binary(4)) AS int) AS ExtraBias_DST, -- -60 for most timezones: DST makes UTC 1 hour earlier
-- When DST ends:
CAST(CAST(REVERSE(SUBSTRING(Data, 13, 2)) AS binary(2)) AS smallint) AS StdYear, -- 0 = yearly (else once)
CAST(CAST(REVERSE(SUBSTRING(Data, 15, 2)) AS binary(2)) AS smallint) AS StdMonth, -- 0 = no DST
CAST(CAST(REVERSE(SUBSTRING(Data, 17, 2)) AS binary(2)) AS smallint) AS StdDayOfWeek, -- 0 = Sunday to 6 = Saturday
CAST(CAST(REVERSE(SUBSTRING(Data, 19, 2)) AS binary(2)) AS smallint) AS StdWeek, -- 1 to 4, or 5 = last <DayOfWeek> of <Month>
CAST(CAST(REVERSE(SUBSTRING(Data, 21, 2)) AS binary(2)) AS smallint) AS StdHour, -- Local time
CAST(CAST(REVERSE(SUBSTRING(Data, 23, 2)) AS binary(2)) AS smallint) AS StdMinute,
CAST(CAST(REVERSE(SUBSTRING(Data, 25, 2)) AS binary(2)) AS smallint) AS StdSecond,
CAST(CAST(REVERSE(SUBSTRING(Data, 27, 2)) AS binary(2)) AS smallint) AS StdMillisec,
-- When DST starts:
CAST(CAST(REVERSE(SUBSTRING(Data, 29, 2)) AS binary(2)) AS smallint) AS DSTYear, -- See above
CAST(CAST(REVERSE(SUBSTRING(Data, 31, 2)) AS binary(2)) AS smallint) AS DSTMonth,
CAST(CAST(REVERSE(SUBSTRING(Data, 33, 2)) AS binary(2)) AS smallint) AS DSTDayOfWeek,
CAST(CAST(REVERSE(SUBSTRING(Data, 35, 2)) AS binary(2)) AS smallint) AS DSTWeek,
CAST(CAST(REVERSE(SUBSTRING(Data, 37, 2)) AS binary(2)) AS smallint) AS DSTHour,
CAST(CAST(REVERSE(SUBSTRING(Data, 39, 2)) AS binary(2)) AS smallint) AS DSTMinute,
CAST(CAST(REVERSE(SUBSTRING(Data, 41, 2)) AS binary(2)) AS smallint) AS DSTSecond,
CAST(CAST(REVERSE(SUBSTRING(Data, 43, 2)) AS binary(2)) AS smallint) AS DSTMillisec
FROM #tztable;
DROP TABLE #tztable
Bir (karmaşık) T-SQL işlevi bu verileri , geçerli DST kuralı sırasındaki tüm tarihler için tam kaymayı belirlemek üzere kullanabilir .