Remove using deprecated DateUtils.

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8491 5f5364db-9458-4db8-a492-e30667be6df6
improved error message

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8492 5f5364db-9458-4db8-a492-e30667be6df6
prototype 1.7.1 testsuite added

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8493 5f5364db-9458-4db8-a492-e30667be6df6
prototype 1.7.1 testsuite added

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8494 5f5364db-9458-4db8-a492-e30667be6df6
prototype 1.7.1 testsuite added

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8495 5f5364db-9458-4db8-a492-e30667be6df6
prototype 1.7.1 testsuite added

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8496 5f5364db-9458-4db8-a492-e30667be6df6
prototype 1.7.1 testsuite added

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8497 5f5364db-9458-4db8-a492-e30667be6df6
prototype 1.7.1 testsuite added

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8498 5f5364db-9458-4db8-a492-e30667be6df6
prototype 1.7.1 testsuite added (finally)

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8499 5f5364db-9458-4db8-a492-e30667be6df6