/usr/share/zsh/functions/Calendar/ is in zsh-common 5.1.1-1ubuntu2.3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/zsh/functions/Calendar/after
/usr/share/zsh/functions/Calendar/age
/usr/share/zsh/functions/Calendar/before
/usr/share/zsh/functions/Calendar/calendar
/usr/share/zsh/functions/Calendar/calendar_add
/usr/share/zsh/functions/Calendar/calendar_edit
/usr/share/zsh/functions/Calendar/calendar_lockfiles
/usr/share/zsh/functions/Calendar/calendar_parse
/usr/share/zsh/functions/Calendar/calendar_read
/usr/share/zsh/functions/Calendar/calendar_scandate
/usr/share/zsh/functions/Calendar/calendar_show
/usr/share/zsh/functions/Calendar/calendar_showdate
/usr/share/zsh/functions/Calendar/calendar_sort