Value of 60 allows to display the selected dates + let a margin if year is in 4 numbers one day.

Change-Id: I3d7db50dd318897b0b7a515f9428401c53218c08
Reviewed-on: https://gerrit.libreoffice.org/18786Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
(cherry picked from commit 9e99b18f)
Reviewed-on: https://gerrit.libreoffice.org/18790Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>