The output is the same as just &quot;cal&quot; for me, so I had to see what it&#x27;s about: It puts Monday as the first day of the week. I guess that is because I use the German date locale. Seems that the US uses Sunday as the first day of the week in calendars and such, but does it make any difference beyond those? Don&#x27;t people &quot;feel&quot; that Monday is the first day of the week because the weekend is over and they have to get back to work?