This will later be part of a lon­ger chap­ter about Calen­dar. For now, it will be a stan­da­lone post without any intro­duc­tion to Calen­dar — this will come later. It...

This will later be part of a lon­ger chap­ter about Calen­dar. For now, it will be a stan­da­lone post without any intro­duc­tion to Calen­dar — this will come later.
It is pos­sible to select an arbi­trary date range with calen­dar, as shown here.
Just a limi­ta­tion: after more than seven days in a row, Google Calen­dar switches to week selec­tion. Which means that after 7 days comes not only 14 days, but also Mon­day to Sun­day (or Sun­day to Mon­day, depen­ding on your locales). And that you can’t have a ten-days calendars.