Two previous (and similar) bugs were reported via Bugzilla by me: #4064 and #15567.
If I attempt to locate them by searching by Reporter (i.e., firstname.lastname@example.org)
or by keywords in Summary ("Incorrect timestamp"), only the newer one
(#15567) is found by the Bugzilla search engine. Searching by Bug number
finds both of them.
Please reopen and change version to 2.18 if this problem still occurs with the
latest release of Bugzilla.
OK, it now seems to be working. Hmmm... I notice I submitted this bug
over 5 years ago. :-)