fix: considering timezone

Due to emergency to publish, timezone delta have been hardcoded ("+2").

This hardcoded should be removed, and timezone to be set as parameter.

Take care of this error:

TypeError: can't compare offset-naive and offset-aware datetimes

assigned to @Plumtree3D

mentioned in merge request !8 (merged)

added Need review label

mentioned in commit 01793720

closed with merge request !8 (merged)

removed Need review label