How to add days to date and get new date on Linux

I brought eggs from the market, and it says best before 20 days from the date of packing. Say my egg box was packed on 29/July/2020. How do I add days to date using Linux CLI? I want to find out date 29/July/2020 + 20days using the CLI, and how do I do it?

The post How to add days to date and get new date on Linux appeared first on nixCraft.