DateTime() constructor

[Mike Suchoff]

In default constructor of DateTime
  DateTime::DateTime() : Date(), Time() {}

The separate calls to Date() and Time() will each make a different call to
operating system for current time.
If call to Date() returns 12/31/2002 23:59:59 and call to Time() returns
1/1/2003 0:0:0 then you end up with value that is off by 24 hours
(12/31/2002 0:0:0).