[Bug 234663] calendar(1): Parsing of MonSecond in January 2019 is wrong

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234663

            Bug ID: 234663
           Summary: calendar(1): Parsing of MonSecond in January 2019 is
                    wrong
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: katsu at miyoshi.matsuyama.ehime.jp

====================================
% grep Adults /usr/share/calendar/calendar.holiday
01/MonSecond    Adults Day in Japan
====================================

"Adults Day in Japan" is the second Monday in January.

====================================
% calendar -A 30 -t 1.1.2019 -f /usr/share/calendar/calendar.holiday|grep
Adults
Jan  7* Adults Day in Japan
====================================

This is incorrect.

====================================
% cal
    January 2019
Su Mo Tu We Th Fr Sa
       1  2  3  4  5
 6  7  8  9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31
====================================

The correct result is

"Jan 14* Adults Day in Japan".

It is correct to try it with "01/TueSecond  Test Day"

====================================
% calendar -A 30 -t 1.1.2019 -f TestDayfile
Jan  8* Test Day
====================================

Only Monday is wrong. And on February Thursday is wrong.
It seems that the day before the first day of the month is being counted in the
first week.

Thanks.

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