Lets say there is a web conference in New York at 7pm. What time will that be for me in Sydney, Australia? TimeZone Calculator will convert the time to your tome zone based on the location of your phone or tablet. You can then send the event to your calendar from within the app.
It also runs what-if scenarios to calculate what the time for you will be in other time zones.
Google Play link: http://goo.gl/I2aGG
This useful app is made by our friendwho is now working on some bigger apps so we will probably hear more from him soon.