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Running version 3.34. The output of gnome-calendar --help is

Usage:
  gnome-calendar [OPTION…]

Help Options:
  -h, --help                 Show help options
  --help-all                 Show all help options
  --help-gapplication        Show GApplication options
  --help-gtk                 Show GTK+ Options

Application Options:
  -q, --quit                 Quit GNOME Calendar
  -v, --version              Display version number
  -d, --debug                Enable debug messages
  --date                     Open calendar on the passed date
  -u, --uuid                 Open calendar showing the passed event
  --display=DISPLAY          X display to use

-d should enable debug messages, but it seems that it is being interpreted as --date instead.

$ gnome-calendar -d
Missing argument for -d
$ gnome-calendar --date
Missing argument for --date

I believe the issue is with this line where it appears that --date has the same short option name as --debug above it.