Fix day-of-week string indexing to obey Python definition #27
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Python defines "time.struct_time.tm_wday" (the day-of-week element) as
"range [0, 6], Monday is 0"; see:
https://docs.python.org/3/library/time.html#time.struct_time
When expanding the day-of-week integer to a string, the code incorrectly
used Sunday-as-0; probably a cut&paste error brought over from C code.