use String::Formatter method_stringf => {
 -as => 'datetimef',

  codes => {
   f => 'strftime',
   c => 'format_cldr',
   s => sub { "$_[0]" },
   },
};
print datetimef("%{%Y-%m-%d}f is the same as %{yyyy-MM-dd}c.", DateTime->now);