How to convert numeric number into datatime

问题

I need help to convert a bigint value into a datetime value using SQL Server.
Example value 634254092190100000

How to convert to datetime value?

So far this is what I have but getting an error:

Arithmetic overflow error converting expression to data type int

select dateadd(s, convert(bigint, 632979854880200000) / 1000, convert(datetime, '1-1-1970 00:00:00'))

回答1:

Please do :

SELECT CAST((YOURVALUE- 599266080000000000) / 864000000000 AS datetime)

For exemple :

SELECT CAST((635307578922100000 - 599266080000000000) / 864000000000 AS datetime)

Gives "2014-03-18 16:44:52"

Knowing that :
- 599266080000000000 is 19000101
- 864000000000 is the number of ms / day
- 599266080000000000 / 864000000000 = 693595 /365 = 1900 (aprox)

Please see https://docs.microsoft.com/fr-fr/sql/t-sql/functions/date-and-time-data-types-and-functions-transact-sql for further details about starting day for each datetime type family...

来源：https://stackoverflow.com/questions/46491686/how-to-convert-numeric-number-into-datatime