How to uninstall CLI & install latest version of CLI

npm uninstall -g angular-cli // Use sudo before to give administrator permission
npm cache clean or npm cache clean --force
To reinstall the latest version try this
npm install -g @angular/cli@latest

below for angular5
npm uninstall -g angular-cli
npm cache clean
npm install -g @angular/cli@1.5
or

npm install -g @angular/cli@5.0.0 

date picker issue

npm install ngx-bootstrap@2.0.5 --save