I make a lot of international calls at work to US clients and prospects. Unfortunately, many of the calls are to different people in different cities. I’m not yet at a point where I associate particular US area codes with their timezones (nor country codes with timezones for that matter), and to be honest I’m not sure if I ever want to be that familiar with them.
My process used to be laborious: visit Bennet Yee’s Area Code Listing, by Number and look up the state to which the area code corresponds, visit Wikipedia and look up the capital city of the state, then visit the World Clock Meeting Planner and see how our timezones overlap. This got old pretty fast.
I’ve solved this problem with Sundial, a US telephone number to timezone converter. It’s a simple webservice which takes any old telephone number and, if it’s a US number, produces a timezone comparision chart to show how it corresponds to GMT. Sundial is freely available for public use, so please give it a try!
You can use Sundial in a few different ways. The simplest is to visit the Sundial converter and enter a US telephone number that you would like to lookup. Format is not important–stick it in with brackets, periods, warts and all. Alternatively, to convert Mobile: (651) 342.2323 you can just navigate directly to [http://sundial.barbersmith.com/Mobile: (651) 342.2323](http://sundial.barbersmith.com/Mobile: 651 342.2323) and get the answer you’re looking for.
Sundial is still under development, so I’d love to hear any suggestions you might have or fix any bugs you might come across. Let me know how you get on in the comments, or drop me an email.