Fix date_formatter test

When deciding the UTC offset to contruct the regex that checks
proper UTC formatting, the tested date should be used instead
of the current date.
Merge pull request #86 from patricklodder/datefmt_utc_test_fix

Fix date_formatter test
update to support the latest xmlbuilder
Merge pull request #92 from danc86/update-xmlbuilder

update to support the latest xmlbuilder