wrapped-date independence from underscore

Change-Id: I8262096b245fd6bce335f63404e3428b29854c7d
Reviewed-on: http://review.couchbase.org/30287
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>