Most of the world uses metric units for volume, distance, and mass. If you need to convert a measurement to or from a metric measurement, these sites can help.

Megaconverter
With a drag of a mouse and a click of a button, convert your units to and from nearly any unit you can think of.

Unit Conversion Factors
If you want to convert your units the old-fashioned way, you can get unit-conversion factors from this page.

Because Planet Diary reports global news, you may have to convert times from other time zones to your local time. For all practical purposes, Greenwich mean time (GMT) is the same as coordinated universal time (UTC or UT). Here are several ways to figure out the time difference between your home and other parts of the world.

Universal Time
Get the coordinated universal time right now!

Time Zone Map
A huge color-coded time-zone map.

Local Times Around the World
What time is it in Sydney, Australia, right now? Bogota, Colombia? The answer is just a few clicks away.

Want to get a better view of a particular country? Want to locate a spot that is underwater? These sites can help.

Map Machine
Check out this National Geographical site to find maps for all parts of the globe.

TIGER Mapping Service
Type in your zip code and this resource from the U.S. Census Bureau will draw you a map of your hometown, complete with roads and bodies of water. You can also use this resource to get population statistics about your city, as well as longitude and latitude. Find other geographic name servers at this Yahoo site.

Earth Viewer
What parts of Earth are in the sun and what parts are in the dark at this moment? Night and day are visualized on this map.

World POPClock
What is the population of the world at this second? Here's the U.S. Census Bureau's best guess.