code: def round_hour(dt):
      return dt.replace(minute=0, second=0, microsecond=0)
  
file_path: matplotlib/tools/github_stats.py
imports: import sys
  from argparse import ArgumentParser
  from datetime import datetime, timedelta
  from subprocess import check_output
  from gh_api import get_paged_request, make_auth_header, get_pull_request, is_pull_request, get_milestone_id, get_issues_list, get_authors
label_desc: Use image node_id 1 for calling a global function with example usage: round_hour(dt) and returns: dt