I am doing some imports of data that includes time zone conversion. Data that I am importing is in America/New_York timezone and I have to import it as UTC timestamp. 

I tried some examples I found on the internet, like:
```
    to_timestamp(tar.read_at_date || ' ' || tar.read_at_hour, 'MM/DD/YYYY HH24:MI')::timestamp without time zone at time zone 'America/New_York' at time zone 'utc'
```
and this seemed to work well for most of the data, however, I noticed some strange conversions at specific times, like Postgres is applying daylight saving for UTC time zone (???).

To quickly illustrate behavior, look at examples and results below:
```
select ('2023-03-25 22:00:00'::timestamp at time zone 'America/New_York' at time zone 'utc');
result: 2023-03-26 03:00:00.000

select ('2023-03-25 23:00:00'::timestamp at time zone 'America/New_York' at time zone 'utc');
result: 2023-03-26 03:00:00.000
```

I am running these queries on:
```
PostgreSQL [15.5
PostgreSQL 15.5 on aarch64-unknown-linux-gnu, compiled by gcc (GCC) 7.3.1 20180712 (Red Hat 7.3.1-6), 64-bit]```

Also, to mention, in 2023, daylight saving time in New York started on Sunday, March 12, 2:00 am. What is interesting here is that on March 26th 2023 at 2am is when clocks go forward in Europe. 

Any reasonable explanation why this happens?