Problem in convert time zones feature. When the base time zone is changed, it should subsequently change tone zones properly. Say initially I take London (gmt) at top, set India, New Delhi as time zone to convert for say Dec 15,2017 it shows correctly as per gmt +5:30. But now I change top time zone to India(gmt+5.30) the one at bottom New Delhi should show same time that I selected, but it shows further addition of 5.30hrs, which is wrong.
You can add different geographies and convert them too
Could've been better
This is accurate and usefull for time diagnosr purposses
Update timezone database to 2017 latest.
Added data for Beijing, Saint Petersburg, Milan, Washington DC and India.