[英]MSSQL - Convert milliseconds since 1970 to datetime2
請考慮以下查詢(在MSSQL 2008中):
SELECT dateModified FROM SomeTable;
這將以javascript格式返回浮點數(自1970年以來的毫秒數):
dateModified
============
1301598290687
1071003581343
1311951478593
如何在選擇中將其轉換為datetime2?
使用@Mikeal Eriksson在這里的答案中的公式。
我會將浮點數轉換為bigint,然后創建日期時間:
select
DATEADD(MILLISECOND,
cast(dateModified as bigint) % 1000,
DATEADD(SECOND, cast(dateModified as bigint) / 1000, '19700101'))
from sometable
一些Oracle示例 - 使用eqivalent替換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
創建雙表:
CREATE TABLE DUAL
(
DUMMY VARCHAR(1)
)
GO
INSERT INTO DUAL (DUMMY)
VALUES ('X')
GO
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