MSSQL-将1970年以来的毫秒转换为datetime2

考虑以下查询（在MSSQL 2008中）：

这将返回javascript格式的浮点值（自1970年以来的毫秒）：

如何使用中的公式将其转换为select？

中的datetime2

我会将float转换为bigint，然后创建datetime：

select 
  DATEADD(MILLISECOND, 
          cast(dateModified as bigint) % 1000, 
          DATEADD(SECOND, cast(dateModified as bigint) / 1000, '19700101'))
from sometable

---

参见

一些Oracle示例-用eqivalent替换to_date（）：

  SELECT (1301598290687/60/60/24/1000) as Days
   , to_date('01-01-1970','dd-mm-yyyy') as start_date
   , to_date('01-01-1970','dd-mm-yyyy')+(1301598290687/60/60/24/1000) as converted_date
  FROM dual
  /

DAYS                START_DATE      CONVERTED_DATE
---------------------------------------------------------
15064.7950310995    1/1/1970        3/31/2011 7:04:51 PM

创建双表：

CREATE TABLE DUAL
(
DUMMY VARCHAR(1)
)
GO
INSERT INTO DUAL (DUMMY)
 VALUES ('X')
GO

  SELECT (1301598290687/60/60/24/1000) as Days
   , to_date('01-01-1970','dd-mm-yyyy') as start_date
   , to_date('01-01-1970','dd-mm-yyyy')+(1301598290687/60/60/24/1000) as converted_date
  FROM dual
  /

DAYS                START_DATE      CONVERTED_DATE
---------------------------------------------------------
15064.7950310995    1/1/1970        3/31/2011 7:04:51 PM

CREATE TABLE DUAL
(
DUMMY VARCHAR(1)
)
GO
INSERT INTO DUAL (DUMMY)
 VALUES ('X')
GO