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Django ORM stores date time in your SQL database’s corresponding field. The underlying SQL column is determined by the used database. E.g. for MySQL, the mappings are defined here:
https://github.com/django/django/blob/master/django/db/backends/mysql/creation.py#L16
Conversion from Django to SQL:
https://github.com/django/django/blob/master/django/db/backends/mysql/base.py#L272
Conversion from SQL to Django:
https://github.com/django/django/blob/master/django/db/models/fields/init.py#L1186
Python datetime.datetime.now() is so-called timezone-naive datetime and doesn’t have any timezone information. Thus, you may lose information when storing times with it and it’s usage is discouraged. It returns the local time. It seems that that if timezone information is omitted, the Django USE_TZ setting determines if the default timezone information is retrofitted internally.
Instead, you should use django.utils.timezone.now() (local time with timezone) or django.utils.timezone.utcnow() (time with UTC timezone).
More info
https://docs.djangoproject.com/en/dev/topics/i18n/timezones/#naive-and-aware-datetime-objects