As our readers might know, we unfortunately live in different countries (but see each other all the time) and have clients on three continents. While we can certainly easily figure out what time it is in Vienna -- currently Pacific + 9 -- things get complicated when we collaborate with a client who's in neither one of our time zones. While it's simple math, time zones can be difficult to figure out, and we've received plenty of late (or early) phone calls from folks who don't do their math right. As services providers, we want to make sure we don't wake anyone up, so we have to determine precisely what time it is in our customer's city. The best free online tool out to figure what time and date it is anywhere in the world that we've found is TimeandDate.com. We've tested it many times, in tricky situations, in countries that might or might not observe Daylight Savings Time (quite a challenge when we were in Chile and the switch was postponed by a month), and the site always gets it right. It's free and there's nothing to download. Before you call a customer, check the website to see if it's a good time to call. If your customer's signature or website does not tell you his or her place of residence, try googling the area and/or country code.
By the way, it's now 9:02 in Montevideo, and 2:02 p.m. in Vienna, where we are happily working together.