Time and Date

www.timeanddate.com

Here's just some of what you can find or do at this website:

Current local times around the world
Make a Personal World Clock
World Clock Meeting Planner-This utility should help you find a convenient time, so that no one has to be up during the middle of the night.
Time Zone Converter-Do time zone conversions between two cities. This time zone calculator takes into account daylight saving time (DST), local time zone and accepts dates in past or future.
Fixed Time World Clock-Have you planned a web cast, online chat, teleconference call or other event where users from all over the world might participate? The Fixed Time World Clock can help tell your users when this event will happen in their local time zone.

Create Custom Calendars for countries around the world
Calculate duration between two dates- This calculates the duration, counting the day count and the number of days, months and years between two dates.
What date is in x amount of days?
Countdown to any date

. . . . all this and much more are included at this website.