Would be nice to point out that discussion or that legal reason. I
cannot remember.
Me neither, but I definitely do remember the discussion.
Well, since I don't remember the discussion, I briefly looked at two database vendors docs, and found this:
mysql manual: Copyright (2004)
postgres manual: Copyright 1996-2003
Well, I am still not convinced that there is any problem with providing a date interval. BTW the MySQL website does provide a date interval for copyright too, and the php.net website family too.
Goba