Go to:
http://www.timeanddate.com/worldclock/sunearth.html
and then adjust the time in the boxes underneath the map. It will then reload to the date and time in the future, that you requested.
If you set the time to be, say half way through the flight time in hours, then you will get an idea of the daylight pattern. The flight is probably about 14 hours, but it's ten years since I flew that route. Look up departure time and then add 7 hours but have fun adjusting time zones.
A friendly warning, this website (and check out the home page for all of it's World Clock features) can cause you to lose hours of time!!
