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The default behaviour of the Unix utility "cal" is to start the week on the day that corresponds to the LC_TIME locale. Under en_GB, it's Monday, under en_US, it's Sunday (and under cs_CZ, it's Pondělí, which corresponds to Monday). Adding the third argument to pcal makes it possible to emulate at least both the English approaches.
The expected behaviour is the following commands should succeed:
pcal 7 2023 1 | diff -wB - <(LC_ALL=en_GB.utf8 cal)
pcal 7 2023 0 | diff -wB - <(LC_ALL=en_US.utf8 cal)