If you want to quickly calculate days between two dates, you can make use of the Linux dateutils ddiff command, lets see some example,
First, make sure that you have dateutils installed on your system, if not you then install it using package manager like apt-get if you are using Linux based OS or brew if using macOS
For Linux# apt-get install dateutils
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
dateutils
Preparing to unpack .../dateutils_0.4.5-1.1_arm64.deb ...
Unpacking dateutils (0.4.5-1.1) ...
Setting up dateutils (0.4.5-1.1) ...% brew install dateutils
% ddiff 2022-01-01 2022-03-01
59
% ddiff 2022-01-01 2022-01-01
0
% ddiff 2022-01-01 2022-01-02
1
% ddiff 2022-01-01 2022-01-20
19
% ddiff 2022-01-01 2022-03-01 -f '%ww %dd'
8w 3d
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