Do you need to check what day of the week it will be four years from today or what type of present to get for your friend's 23rd wedding anniversary? Just ask Wolfram|Alpha for information about the important dates and anniversaries in your life.
Get calendar information or convert to another calendar system.
When in the world is Carmen Sandiego?
Investigate dates of civic and religious holidays.
Add or subtract time and figure out how many days/hours/minutes between times.
Find out information about what happened or will happen on a certain date or how to celebrate a certain date.