Doing Date Math on the Command Line, Part I

If you’ve ever used a spreadsheet, you’ve probably used or seen
functions for doing date math—in other words, taking one date and adding some number
of days or months to it to get a new date, or taking two
dates and finding the number days between them.
The same thing can be done from the command line using
the lowly date command, possibly with a little
help from Bash’s arithmetic.

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