Working with people in different time zones presents multiple problems. Answering the simple questions of what time is it now and what time is it at a future date and time can be confusing.
Trick 1 – Web solution
http://www.timeanddate.com/
Here is an example of a link that will show a future time for the major cities worldwide
http://www.timeanddate.com/
Trick 2 – Windows utility
A useful desktop clock called Qlock allows you to see the current time in cities of your choice as well as picking a future date and time.