How should the dates change for a passenger of an airplane in the near future, who, keeping score in standard time

How should the dates change for a passenger of an airplane in the near future, who, keeping score in standard time, flew from Leningrad (zone 2) to the west at noon on July 1 and circled the Earth in parallel in 12 hours?

From 1 to 2 July when crossing the date change line from 2 to 1 July when entering the 2nd zone, from 1 to 2 July at the time of landing.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.