FYI: Google does have a limited 'command line' tool for time zone differences. If you search for "London time", it will return the current time in London UK in bold, along with London, Ontario and London, Arkansas.
This obviously is only for the current time, and you'll find that it doesn't work for everywhere. Also I've encountered occasional 'outages' where the time results for reliable locations aren't posted in your search results. I guess the applet gets disengaged occasionally due to back-end business.
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FYI: Google does have a limited 'command line' tool for time zone differences. If you search for "London time", it will return the current time in London UK in bold, along with London, Ontario and London, Arkansas.
This obviously is only for the current time, and you'll find that it doesn't work for everywhere. Also I've encountered occasional 'outages' where the time results for reliable locations aren't posted in your search results. I guess the applet gets disengaged occasionally due to back-end business.