Для работы с экстра полями, где тип данных дата и время, - читайте руководство в этой статье “Экстраполя в Cotonti: Тип данных datetime. Полное руководство”.
Кроме этого, для обсуждения именно даты и времени в экстраполях, создана отдельная тема, где вы можете, что-то почерпнуть для себя из примеров или задать вопрос по теме.
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