old_contents: from .chdir import chdir
  from .dirsize import dirsize
  from .find_unmerged_branches_in_cwd import find_unmerged_branches_in_cwd
  from .flatten import flatten
  from .group_by import group_by
  from .parse_commit_msg_for_assignments import parse_commit_msg_for_assignments
  from .run import run
  from .version import version
  
new_contents: from .chdir import chdir
  from .check_submit_date import check_dates
  from .dirsize import dirsize
  from .find_unmerged_branches_in_cwd import find_unmerged_branches_in_cwd
  from .flatten import flatten
  from .group_by import group_by
  from .parse_commit_msg_for_assignments import parse_commit_msg_for_assignments
  from .run import run
  from .version import version
  
subject: Add check_dates to init.py