Add hours/minutes to datetime

I’m having an issue on how to add the Offset to the EventDateTime. Is there a way to do this? I would convert it to a decimal number but cannot because 5:30 is not 5.3 hours, it’s 5 hours and 30 minutes.

The data is shown below with the expected output. Please help if possible.

Sample Data:

+-----------+-----------+---------------------+-------------------------+--------+
| EventDate | EventTime |    EventDateTime    |        TimeZone         | Offset |
+-----------+-----------+---------------------+-------------------------+--------+
| 10/1/2020 | 5:00 PM   | 2020-10-01 5:00 PM  | UTC +5:30 IST New Delhi | +5:30  |
| 10/1/2020 | 8:00 PM   | 2020-10-01 8:00 PM  | UTC +5:30 IST New Delhi | +5:30  |
| 10/2/2020 | 10:00 AM  | 2020-10-02 10:00 AM | UTC -4 EDT New York     | -4     |
| 10/2/2020 | 10:00 AM  | 2020-10-02 10:00 AM | UTC -7 PDT Los Angeles  | -7     |
| 10/2/2020 | 2:00 PM   | 2020-10-02 2:00 PM  | UTC +1 BST London       | 1      |
| 10/2/2020 | 3:00 PM   | 2020-10-02 3:00 PM  | UTC -7 PDT Los Angeles  | -7     |
| 10/2/2020 | 8:00 AM   | 2020-10-02 8:00 AM  | UTC -7 PDT Los Angeles  | -7     |
| 10/5/2020 | 10:00 AM  | 2020-10-05 10:00 AM | UTC +5:30 IST New Delhi | +5:30  |
| 10/5/2020 | 10:00 AM  | 2020-10-05 10:00 AM | UTC -5 CDT Chicago      | -5     |
+-----------+-----------+---------------------+-------------------------+--------+

Expected Outcome:

+-----------+-----------+---------------------+-------------------------+--------+---------------------+
| EventDate | EventTime |    EventDateTime    |        TimeZone         | Offset |     UTCDateTime     |
+-----------+-----------+---------------------+-------------------------+--------+---------------------+
| 10/1/2020 | 5:00 PM   | 2020-10-01 5:00 PM  | UTC +5:30 IST New Delhi | +5:30  | 2020-10-01 10:30 PM |
| 10/1/2020 | 8:00 PM   | 2020-10-01 8:00 PM  | UTC +5:30 IST New Delhi | +5:30  | 2020-10-02 1:30 AM  |
| 10/2/2020 | 10:00 AM  | 2020-10-02 10:00 AM | UTC -4 EDT New York     | -4     | 2020-10-02 6:00 AM  |
| 10/2/2020 | 10:00 AM  | 2020-10-02 10:00 AM | UTC -7 PDT Los Angeles  | -7     | 2020-10-02 3:00 AM  |
| 10/2/2020 | 2:00 PM   | 2020-10-02 2:00 PM  | UTC +1 BST London       | 1      | 2020-10-02 3:00 PM  |
| 10/2/2020 | 3:00 PM   | 2020-10-02 3:00 PM  | UTC -7 PDT Los Angeles  | -7     | 2020-10-02 8:00 AM  |
| 10/2/2020 | 8:00 AM   | 2020-10-02 8:00 AM  | UTC -7 PDT Los Angeles  | -7     | 2020-10-02 1:00 AM  |
| 10/5/2020 | 10:00 AM  | 2020-10-05 10:00 AM | UTC +5:30 IST New Delhi | +5:30  | 2020-10-05 3:30 PM  |
| 10/5/2020 | 10:00 AM  | 2020-10-05 10:00 AM | UTC -5 CDT Chicago      | -5     | 2020-10-05 5:00 AM  |
+-----------+-----------+---------------------+-------------------------+--------+---------------------+

What I have done so far:

Answer

Not exactly pretty, but it works…

DECLARE @eventDateTime VARCHAR(50), @offset varchar(10)

SET @eventDateTime = '2020-09-30 5:00AM'
SET @offset = '-5:30'

SELECT CASE WHEN @offset LIKE '-%' THEN CONVERT(DATETIME,@eventDateTime) - REPLACE(@offset,'-','')
        ELSE CONVERT(DATETIME,@eventDateTime) + REPLACE(@offset,'+','')
        END

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Answer