ayatana-indicator-datetime from home:Ionic:branches:X11:Unity project

需要 openSUSE Tumbleweed ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/home:Ionic:branches:X11:Unity/openSUSE_Tumbleweed/home:Ionic:branches:X11:Unity.repo
zypper refresh
zypper install ayatana-indicator-datetime