Capture date change by event drag

Drag and Drop case on calendar.
When dragging an event from one date to another, it only records, automatically in the log, two records that report access, but the modification made to the dates due to the dragging effect is recorded.
The only thing I am looking for is to register the event of automatic modification of the dates in the calendar event without the need to edit the event and press the update registration button …
Finally:
Where can I verify that the start and end dates have been modified by the dragging of the event?

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