avoid unnecessary store operation

git-svn-id: http://h2database.googlecode.com/svn/trunk@5915 e6896862-9d19-0410-bfb3-e9fa5d50e656
Documentation

git-svn-id: http://h2database.googlecode.com/svn/trunk@5916 e6896862-9d19-0410-bfb3-e9fa5d50e656
Improved performance for some date / time / timestamp conversion operations.

git-svn-id: http://h2database.googlecode.com/svn/trunk@5917 e6896862-9d19-0410-bfb3-e9fa5d50e656