One thing I do all the time and hate to do is figuring out a good time for a meeting between my location, New York and places overseas, like in Australia, Israel, the UK and so forth.
There are web sites that do the conversion, but I find it always confusing. Wolfram Alpha does it well, so I often use that search engine.
But it seems Google recently added the feature, or maybe they had it for a while, I don't think they have.
Matt Cutts posted about it on Twitter and it does work:
Example A: 8:30 pm in Israel to New York time:
Example B: 9 pm sydney, australia to EDT:
Example C: 8am gmt to pst:
Example D: 5pm in new york is when in london:
Forum discussion at Twitter.