Remove ss from Date/Time field

Remove ss from Date/Time field

I am unclear on what the formula needs to be to remove the seconds :ss from a Date/Time field. This solution is unclear  https://support.zoho.com/portal/zohocorp/ShowEntityInfo.do?module=Solutions&id=677280f03da271dd1f1cd9c6123cc8de&from=listView&showpage=DetailsView&&prevModule=Solutions&TO_INDEX=10&FROM_INDEX=1&currentOption=50&selectedDept=71d0ea6e5216eb98d3e3b1cbce495042&cvid=null&recordNum=3&ct=1358056144062&isload=true

Can someone provide the correct formula expression please?