How can I create a fake or simulated version of datetime.utcnow() in Python?

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One way to create a fake or simulated version of datetime.utcnow() in Python is by creating a custom function that returns a predetermined datetime object instead of the actual current UTC datetime. Here is an example code snippet:

from datetime import datetime, timezone

def fake_utcnow():
    # Replace with a predetermined datetime object
    return datetime(2021, 9, 13, 12, 30, 0, tzinfo=timezone.utc)

# Usage:
now = fake_utcnow()  # Returns the predetermined datetime object

In this example, the fake_utcnow() function always returns the same datetime object (datetime(2021, 9, 13, 12, 30, 0, tzinfo=timezone.utc)), regardless of when it is called. You can customize this function to return different datetime objects based on your needs.