switchboard-plug-datetime from home:simotek:cmake4macro project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:simotek:cmake4macro/openSUSE_Tumbleweed/home:simotek:cmake4macro.repo zypper refresh zypper install switchboard-plug-datetime