This is the plist file to run a program in /Library at 12:00pm.   <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict>     <key>Label</key>     <string>ca.ab.cbe.ts.updates</string>     <key>ProgramArguments</key>     <array>         <string>/Library/Application Support/Example/.packagerv2</string>     </array>     <key>RunAtLoad</key>     <true/>     <key>StartCalendarInterval</key>     <dict>         <key>Hour</key>         <integer>12</integer>     </dict> </dict> </plist>