Convert timestamp from string to EST time in Synapse

Question

I am new to Synapse Data Warehouse.

Currently, I have a timestamp column named last_update_utc as string data type and it is UTC time. I need to add a new column last_update_est with timestamp as datetime2 data type convert from last_update_utc column - The conversion also needs to account for DST. You can check the sample output below:

id | last_update_utc (string)     | last_update_est (datetime2)
1  | 2020-02-28T17:26:47.483698Z  | 2020-02-28T12:26:47.483698Z
2  | 2021-09-03T22:59:19.093Z     | 2021-09-03T18:59:19.093Z

The first row, It is 5 hours of difference without DST and it is 4 hours of difference with DST. The table name is hub.test and initially, there are id and last_update_utc columns.

Is there a simple function or method to achieve the above task in Synapse DW?

Thanks

Answer 1

Convert string to datetime2 and apply AT TIME ZONE to convert UTC to the required time zone.

SELECT CONVERT(DATETIME2, '2021-09-03T22:59:19.093Z') AT TIME ZONE 'UTC' AT TIME ZONE 'Eastern Standard Time'as last_update_est

Refer to this document to learn more on AT TIME ZONE implementation.