Hey, As an experienced software engineer with a vast background in Java programming, I am confident that I can create a sleek and efficient time-based greeting program for you. My strong understanding of system clocks and compatibility across various operating systems, including Windows, MacOS, and Linux ensures that this project will be completed to your satisfaction. With my expertise in Java development, I can guarantee a seamless running program ensuring it provides the correct greetings for morning, afternoon, and night based on the system time. Lets chat to Proceed.