Travel code calculation 14 days refers to the user's travel calculation in the previous 14 days, which is completed in the operator's background. The statistical rule is that if you stay in the local area for more than 4 hours, it will be cancelled, and 14 days will not be counted until 4 hours after you return to your destination. The result was delayed by one day. Part of the operator's statistics will be counted at night, so that places you have been to before 14 days will update your travel itinerary during the day of 15 days.