The postponed Olympic Games will now begin on July 23 next year and run until August 8, the head of the Tokyo 2020 organising committee announced on Monday.
The Games were postponed last week and the delay is the first in the 124-year history of the modern Olympics.
The postponement represents a huge blow for Japan, which invested $13bn in the run-up to the event, and raised $3bn from domestic sponsors.
Yoshiro Mori, the head of the Tokyo 2020 organizing committee, confirmed the new dates after he made the decision with the International Olympic Committee.
The Paralympic Games will also run from August 24-September 5.
%%%twitter https://twitter.com/hashtag/Tokyo2020?src=hash&ref_src=twsrc%5Etfw">#Tokyo2020Paralympic Games will be held from 24 August until 5 September 2021. pic.twitter.com/VIecByJdJD
— #Tokyo2020 (@Tokyo2020)
Earlier in the day, the Games' chief executive, Toshiro Muto, said the committee was moving "in the direction" of honouring tickets bought for the 2020 Games at the rescheduled event, or providing refunds in case of scheduling changes.
Muto said: "We want to honour the hopes of all those who purchased the tickets amid high demand.”
The IOC and Japanese government succumbed to intense pressure from athletes and sporting bodies around the world last Tuesday by agreeing to push back the Games because of the coronavirus pandemic.