Do you need to make a call to someone far away? Do you need to arrange a videoconference, telephone- or net-based meeting with several people spread around the world? Then, the site http://www.timeanddate.com/worldclock/meeting.html can help you organize your schedule taking into consideration the time zones, so that you don't call anyone at 3 am by accident!
You can easily convert the time zone between two or more cities, and even take into account Daylight Saving Time (DST).
