Django: Unexpected Timezone Handling in Date Queries with PostgreSQL
I'm trying to implement I'm writing unit tests and I'm reviewing some code and Hey everyone, I'm running into an issue that's driving me crazy..... I'm working with an scenario with how Django handles timezone-aware datetime objects when querying my PostgreSQL database. I'm using Django 4.0 and PostgreSQL 13. My models have datetime fields set to `auto_now_add=True` and `auto_now=True`. When I attempt to filter records based on a specific date, the query returns unexpected results due to timezone conversions. Here's a snippet of my query: ```python from django.utils import timezone from myapp.models import MyModel # Let's say I want to filter for records created on 2023-10-01 start_date = timezone.datetime(2023, 10, 1, 0, 0, tzinfo=timezone.utc) end_date = timezone.datetime(2023, 10, 1, 23, 59, 59, tzinfo=timezone.utc) records = MyModel.objects.filter(created_at__range=(start_date, end_date)) ``` This should theoretically return all records created on October 1st, but I’m getting records from October 2nd as well. I suspect this is due to the PostgreSQL timezone settings and how Django interacts with them. I've set `USE_TZ = True` in my settings.py. I’ve also tried using `localtime()` to convert the `start_date` and `end_date`, but that didn’t resolve the question. The actual database is set to UTC. I tried running the same query directly in the PostgreSQL client, and it behaves correctly there. Can anyone shed light on why this discrepancy happens and how I can ensure my Django queries return the expected results? Am I missing something obvious? I'd be grateful for any help. I'm working in a Debian environment. Could this be a known issue? I'm coming from a different tech stack and learning Python. Could this be a known issue?