Why did Python 3.12 remove the datetime.utc function? How to get UTC time in a new version?

Python 3.12 deprecating datetime.utc function: Cause and solution

In Python 3.12, the datetime.utc function has been removed, which has brought challenges to many developers, especially back-end developers. This article will explain why the removal is done and provide the correct way to get UTC time in the new version.

The main reason why datetime.utc function is removed is that the datetime object it returns is "naive datetime", which lacks time zone information. This can easily cause problems in cross-time zone applications. Removing the function and introducing a new API can force developers to value this "breaking change" and thus improve the code.

Many early versions of programming languages ​​have shortcomings in time zone processing. For example, Java's java.util.Date and C#'s System.DateTime both faced similar problems, and later solved them by introducing java.time.LocalDateTime , java.time.ZonedDateTime and System.DateTimeOffset respectively.

So, how to get UTC time in Python 3.12? Assume that the original code uses the following function:

 def get_utc_now_timestamp(tzinfo: bool = True) -> datetime:
    if tzinfo:
        return datetime.utcnow().replace(tzinfo=timezone.utc)
    else:
        return datetime.utcnow().replace(tzinfo=None)

Since datetime.utcnow() has been removed, we can use datetime.now() and specify the time zone:

 from datetime import datetime, timezone

def get_utc_now_timestamp(tzinfo: bool = True) -> datetime:
    if tzinfo:
        return datetime.now(timezone.utc)
    else:
        return datetime.now(timezone.utc).replace(tzinfo=None)

This modification ensures that UTC time is properly fetched in Python 3.12, avoiding the use of removed functions.

This change not only affects Python, but also reflects the continuous improvements in date-time processing of modern programming languages. By removing old functions and introducing new APIs, developers can better deal with time zone issues and improve code reliability and maintainability.

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