Date picker

• allowing the user to enter a date by merely clicking on a date in the pop-up calendar as opposed to having to take their hand off the mouse to type in a date.
• validation of dates by restricting date ranges, e.g. only after today and for two weeks later, or only for dates in the past.
• a date range can be entered such that for a set of "from-to" date fields, if the "from" field is filled, the "to" field cannot be set to a date before the "from" field, or if the "to" field is filled, the "from" field cannot be set to a later date than the "to" field.
• can have a "today" button
• can customize the day the week begins on
• Only legal dates can be entered, e.g. February 29, 2100 can't be entered, nor could June 31.
• Date format confusion is eliminated, e.g. is 7/4/10 July 4, 2010, April 7, 2010, or April 10, 2007?

• Cannot enter an invalid time.
• Cannot select an out of range time, or during unattended times.
• Cannot select an invalid range