Sunday (Sun.) Monday (Mon.) Tuesday (Tue.) Wednesday (Wed.) Thursday (Thu.) Friday (Fri.) Saturday (Sat.)です。 ほかにも、月の名前はJanuary (Jan.) February (Feb.) March (Mar.) April (Apr.) May (May) June (Jun.) July (Jul.) August (Aug.) September (Sep.) October (Oct.) November (Nov.) December (Dec.) と、なります。5月のみ、3文字ですので、そのまま表記となります。