Psych::Visitors::YAMLTree#format_time

# File tmp/rubies/ruby-4.0.0/ext/psych/lib/psych/visitors/yaml_tree.rb, line 520
def format_time time, utc = time.utc?
  if utc
    time.strftime("%Y-%m-%d %H:%M:%S.%9N Z")
  else
    time.strftime("%Y-%m-%d %H:%M:%S.%9N %:z")
  end
end