--- On Thu, 3/1/12, David Patte <dpatte@relativedata.com> wrote:

Time Zone Master, from relativedata.com, is a windows program that does this type of calculation internally. [...] The programme is free from our site, and is packaged as a desktop clock application, but if you are looking for a more specific product for your needs, the internal latlong->tz engine could be rebuilt into something more suitable. Let me know what you are looking for.

Hi David, Thanks for responding, and sorry I have been so slow in getting back to you (work travel the past few weeks; just now catching up). The Windows app looks terrific, but my little project will need to run on a small embedded Linux board (Gumstix Overo or similar), so I think it's really the internal engine I would want to use. (And in case it matters, this is a one-off personal project I'd been thinking of doing for some time now, so it's strictly non-commercial.) Regards, --HJ