the type in the Any is a util::Date and not a DateTime, fdo#74549

Either that was always broken or it is a recent regression that
operator>>= does not convert from Date to DateTime.

Change-Id: Ic948224c139ed84b3fe006385fcafd6ce16c30f1
(cherry picked from commit 22c7da0ca5438b69165609db2a1ef219aa167dc2)
Reviewed-on: https://gerrit.libreoffice.org/8652
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>