Convert IST to EST time zone format

Question

I want to convert my IST datetime to EST datetime. I tried a few ways but am unable to do it.

SELECT (CAST('2022-07-25 03:06' AS DateTime)) at time zone 'US Eastern Standard Time' AS DATETIME

Output:

2022-07-25 03:06:00.000 -04:00 output is same

Required output in EST timezone

Thanks in advance

Answer 1

For offsets between time zones to work correctly you need to start with time zone-aware data types, such as datetimeoffset .

For example the following parses a time, including time zone offset, into a datetimeoffset value:

select cast('2022-07-25 03:06:00.000 +5:30' as datetimeoffset) as IST

Which outputs:

IST
2022-07-25 03:06:00.0000000 +05:30

And to convert that to a time in the US EST time zone:

select cast('2022-07-25 03:06 +05:30' AS datetimeoffset) at time zone 'US Eastern Standard Time' as EST

Which outputs:

EST
2022-07-24 17:36:00.0000000 -04:00