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?
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Linux Find Out What Compilers Are Installed or Available On The System

How do I find out what compilers are installed on a Debian / Ubuntu / Red hat Enterprise / CentOS Linux operating systems? How do I list all available compiler packages under a Linux operating system using the CLI?
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Debian Linux Install Truetype Fonts For Xorg

How do I install TrueType fonts under Debian GNU/Linux desktop operating systems?
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HowTo: Upgrade Debian 5.0 (Lenny) To Debian 6.0 (Squeeze)

Debian 6.0 “Squeeze” has been released and how do I upgrade to Debian GNU/Linux 6.0 from the previous release, Debian GNU/Linux 5.0 (“Lenny”) using command prompt?
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du Command Output In Human Readable Format ( GB / MB / TB )

I need to get a list of sizes in human readable du output format. How do I get the output for du command in GB under Linux or UNIX operating systems?
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Find: UNIX Operating System Release and Version Number

How do I find Unix version and release number using command line options? What version, release, and maintenance level of Unix is running on my system?
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Linux Command: Show Linux Version

What command I need to type to display Linux kernel version and other information such as Linux distribution name? How do I check Linux kernel version number?
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