A fork for the time-zone database?

I go by (Forename) and am happy for corporate and governmental correspondence to open with "Dear (Forename)" (but also perfectly content for it to open with "Dear Mr (Forename)".

If I were more conservative about correspondence etiquette, I would expect it to open with "Dear Mr (Surname)"... but if I were that conservative about correspondence etiqutte and had a knighthood that they knew about, I would expect them to address me as "Sir (Forename)". And I would expect all of that without having to "jump through hoops" on their website, expecting simply putting my title, forename, and surname to be sufficient.

And as I am, I get mildly grumpy about letters opening "Dear (Forename) (Surname)" because they fall between two stools, satisfying neither my own casualism nor the standards expected by the formalist in my head.