In XP expand the taskbar to two rows by grabbing the top edge and drag
it up. Then the date will display. If need be right click the taskbar
and choose unlock first.
As an alternative, if you only want the taskbar to be one row high,
there are free 3rd party utilities for them. There was a recent,
lengthy, post on here about that topic with numerous ones mentioned.
It's always wise to search the newsgroup messages before posting a new one.
See this message thread:
http://groups.google.com/group/microsoft.public.windowsxp.general/browse_thread/thread /f94c916628539269/bd233c721b02dd71?lnk=st&q=&rnum=2&hl=en#bd233c721b02dd71