However for Grand Tours the period commences at UCI CYCLING REGULATIONS   Page 64 of 70 UCI ADR 2021  midnight three days before the Event  is set to begin and finishes at midnight the day on which the Event  ends (for example: the Event Period  for a one -day road race scheduled to start on 19 December at  10:00 starts on 18 December at 00:01 and finishes on 19 December at 23:59).