您可以使用Pavel Gatilov 博客中的此函数将 64 位整数转换为服务器本地时间毫秒精度的日期时间值:
CREATE FUNCTION NetFxUtcTicksToDateTime
(
@Ticks bigint
)
RETURNS datetime
AS
BEGIN
-- First, we will convert the ticks into a datetime value with UTC time
DECLARE @BaseDate datetime;
SET @BaseDate = '01/01/1900';
DECLARE @NetFxTicksFromBaseDate bigint;
SET @NetFxTicksFromBaseDate = @Ticks - 599266080000000000;
-- The numeric constant is the number of .Net Ticks between the System.DateTime.MinValue (01/01/0001) and the SQL Server datetime base date (01/01/1900)
DECLARE @DaysFromBaseDate int;
SET @DaysFromBaseDate = @NetFxTicksFromBaseDate / 864000000000;
-- The numeric constant is the number of .Net Ticks in a single day.
DECLARE @TimeOfDayInTicks bigint;
SET @TimeOfDayInTicks = @NetFxTicksFromBaseDate - @DaysFromBaseDate * 864000000000;
DECLARE @TimeOfDayInMilliseconds int;
SET @TimeOfDayInMilliseconds = @TimeOfDayInTicks / 10000;
-- A Tick equals to 100 nanoseconds which is 0.0001 milliseconds
DECLARE @UtcDate datetime;
SET @UtcDate = DATEADD(ms, @TimeOfDayInMilliseconds, DATEADD(d, @DaysFromBaseDate, @BaseDate));
-- The @UtcDate is already useful. If you need the time in UTC, just return this value.
-- Now, some magic to get the local time
RETURN @UtcDate + GETDATE() - GETUTCDATE();
END
GO
适合内联使用的替代代码:
DECLARE @Ticks bigint
set @Ticks = 634899090000000000
select DATEADD(ms, ((@Ticks - 599266080000000000) -
FLOOR((@Ticks - 599266080000000000) / 864000000000) * 864000000000) / 10000,
DATEADD(d, (@Ticks - 599266080000000000) / 864000000000, '01/01/1900')) +
GETDATE() - GETUTCDATE()