Thanks for providing a very useful website. Very impressive.
I would like to report a small bug. The timezone for Indian airports is shown as +5 while actually IST (Indian Standard Time) is +05:30. This causes the sunrise, sunset and dusk times for Indian airports to be wrong by 30 minutes.
e.g. for VAAH, the sunset time is shown as 18:21 for today, while actually it is 18:51.