https://www.manpagez.com/man/5/launchd.plist/

[Dick Guertin <dick.guertin@xxxxxxxxx>]

I'm reporting a deficiency in 'launchd.plist(5)' for
'StartCalendarInterval'.  The numeric ranges are NOT shown, as they
were for 'crontab(5)'.  I'm referring to HOUR, MINUTE, MONTH, and
DAY-OF-MONTH and DAY-OF-WEEK.  Some of these ranges begin with 0,
and some with 1.  That's why it's important to SHOW THE RANGES in the
documentation.  Dick.Guertin