如何从AM / PM格式的VARCHAR转换为UTC？

Question

I have a T-SQL VARCHAR column that looks like this:

APR-10-2018 11:33:39 AM
Dec-04-2017 11:14:24 AM
DEC-01-2017 07:24:54 PM
DEC-01-2017 07:20:28 PM
DEC-01-2017 07:19:52 PM

I want to convert it to UTC. I realize it will likely require using the CONVERT function. However, I have been unsuccessful in my attempts to do this. How?

Answer 1

Converting to a DateTime would be small matter. However, we have no idea what your timezone is, or more importantly, the timezone of the data

Example

Declare @YourTable table (SomeCol varchar(50))
Insert Into @YourTable values
 ('APR-10-2018 11:33:39 AM')
,('Dec-04-2017 11:14:24 AM')
,('DEC-01-2017 07:24:54 PM')
,('DEC-01-2017 07:20:28 PM')
,('DEC-01-2017 07:19:52 PM')

Select AsDateTime = try_convert(datetime,replace(SomeCol,'-',' '))
 From  @YourTable

Returns

AsDateTime
2018-04-10 11:33:39.000
2017-12-04 11:14:24.000
2017-12-01 19:24:54.000
2017-12-01 19:20:28.000
2017-12-01 19:19:52.000

Answer 2

You need to read up on cast() and convert() : https://docs.microsoft.com/en-us/sql/t-sql/functions/cast-and-convert-transact-sql?view=sql-server-2017

[Hint: you have to specify the desired date/time style).