date: --debug option not yet implemented #7342

 TZ=America/Belize date --debug -d 'TZ="Asia/Tokyo" Sun, 90-12-11 + 3 days - 90 minutes' +'%a %b %e %T %z %Y'
date: parsed day part: Sun (day ordinal=0 number=0)
date: parsed date part: (Y-M-D) 0090-12-11
date: parsed relative part: +3 day(s)
date: parsed relative part: +3 day(s) -90 minutes
date: input timezone: TZ="Asia/Tokyo" in date string
date: warning: adjusting year value 90 to 1990
date: warning: using midnight as starting time: 00:00:00
date: warning: day (Sun) ignored when explicit dates are given
date: starting date/time: '(Y-M-D) 1990-12-11 00:00:00'
date: warning: when adding relative days, it is recommended to specify noon
date: after date adjustment (+0 years, +0 months, +3 days),
date:     new date/time = '(Y-M-D) 1990-12-14 00:00:00'
date: '(Y-M-D) 1990-12-14 00:00:00' = 661100400 epoch-seconds
date: after time adjustment (+0 hours, -90 minutes, +0 seconds, +0 ns),
date:     new time = 661095000 epoch-seconds
date: timezone: TZ="Asia/Tokyo" environment value
date: final: 661095000.000000000 (epoch-seconds)
date: final: (Y-M-D) 1990-12-13 13:30:00 (UTC)
date: final: (Y-M-D) 1990-12-13 22:30:00 (UTC+09)
date: output format: ‘%a %b %e %T %z %Y’
Thu Dec 13 07:30:00 -0600 1990