How do I format date in TSql when I use json_value

问题

I am using SQL Server 2016 and I am storing json. When I extract it, the datetime format does not show clean. How do I format the datetime format?

select 
    JSON_VALUE(trade, '$.entrytime') AS entrytime 
from 
    dbo.Trades

Values shown:

2016-05-23T05:21:30.3068919-04:00
2016-05-24T10:49:16.337257-04:00
2016-05-24T11:05:30.8941267-04:00
2016-05-24T11:37:35.9555731-04:00

How do I format those dates in the yyyy-mm-dd hh:mm:ss format?

回答1:

You can also use FORMAT:

select FORMAT(CAST(JSON_VALUE(trade, '$.entrytime') as datetimeoffset), 'yyyy-MM-dd hh:mm:ss') AS entrytime from dbo.Trades

回答2:

You want to format the following timestamp to look like the one following it:

2016-05-24T11:37:35.9555731-04:00
2016-05-24 11:37:35

The following query replaces the T with a space, and also substrings off everything which comes after (and including) the period.

SELECT REPLACE(SUBSTRING(JSON_VALUE(trade, '$.entrytime'), 1,
                         CHARINDEX('.', JSON_VALUE(trade, '$.entrytime')) - 1),
               'T', ' ') AS entrytime
FROM dbo.Trades

来源：https://stackoverflow.com/questions/37450492/how-do-i-format-date-in-tsql-when-i-use-json-value