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call-datetime-now-without-tzinfo (DTZ005)

Added in v0.0.188 · Related issues · View source

Derived from the flake8-datetimez linter.

What it does

Checks for usages of datetime.datetime.now() that do not specify a timezone.

Why is this bad?

Python datetime objects can be naive or timezone-aware. While an aware object represents a specific moment in time, a naive object does not contain enough information to unambiguously locate itself relative to other datetime objects. Since this can lead to errors, it is recommended to always use timezone-aware objects.

datetime.datetime.now() or datetime.datetime.now(tz=None) returns a naive datetime object. Instead, use datetime.datetime.now(tz=<timezone>) to create a timezone-aware object.

Example

import datetime

datetime.datetime.now()

Use instead:

import datetime

datetime.datetime.now(tz=datetime.timezone.utc)

Or, for Python 3.11 and later:

import datetime

datetime.datetime.now(tz=datetime.UTC)

References