Show current regional time in a field.

[#1]

For those with international databases or where the country spans multiple time zones, I would like to have a field on the contact + company records that displays the current time at the contact's location.

This will prevent me accidentally calling someone in California at 3:00 am in the morning

To be clear, I DON'T want this as a web info service. I want it in a field that dynamically updates from a web time info site somewhere. The reason for wanting a field is that you then have the flexibility to lookup all the contacts where the time is between 08:00 and 11:30 am for example. You could also create groups for the same purpose.

[#2]

Could this be done with something like World Clock API ?

[#3]

The other reason for wanting a field is so that I can put it on the Contact detail screen where it will always be in full view.