07:29 Saturday 16 December 2017 -02
Good morning from São Paulo! My jetlag seems fine, though we are in a timezone opposite that of Japan, where it is 6:30pm Saturday according to https://time.is/Tokyo
My techique is to switch my clocks to my destination time as soon as I get onto the airplane, and then sleep or stay awake during the flight according to the target schedule.
The more timezones changed, the longer the flight and therefore more time available to do the switch.
For those of you reading from the future, the rate of change for me is roughly one timezone per 2 hours of travel time. (We were in a Boeing 777 and then an Airbus A-380 (my first time to fly one of those).)