If both comparands are aware, and have the same tzinfo member,the common tzinfo member is ignored and the base datetimes are compared. 両方の被演算子が aware で、同じ tzinfo メンバを持つ場合、共通の tzinfoメンバは無視され、基本の datetime 間の比較が行われます。 - Python
No time zoneadjustments are done in this case.If both are aware and have different tzinfo members,a-b acts as if a and b were first converted to naive UTC datetimes first. 両方が aware で異なる tzinfo メンバを持つ場合、a-b は a および b をまず naive な UTC datetimeオブジェクトに変換したかのようにして行います。 - Python
Remember that when setting default dates and times, as well as datetimes, you should research and stay within the epoch of your chosen DBMS, otherwise you will encounter difficult to diagnose errors!
デフォルトの日付および時刻、あるいはタイムスタンプを設定する際には、使用している DBMS でサポートしている範囲を確認しておくようにしましょう。 - PEAR
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