euphoric vs happy as the day is long

euphoric

adj
  • Productive of euphoria, causing great joy 

  • Feeling great well-being or elation or intense happiness; characterized by euphoria 

noun
  • A drug that causes euphoria; a euphoriant. 

happy as the day is long

How often have the words euphoric and happy as the day is long occurred in a corpus of books? (source: Google Ngram Viewer )