to make sure the week object is released correctly.

Found by: zhangjf
Patch by: zhangjf

(cherry picked from commit 1e51e5da)

Conflicts:
	ucb/source/ucp/tdoc/tdoc_stgelems.cxx

Change-Id: I33d0b3b7cda2aa9a220056bf7d641b09036f89e9