Translation of "red-letter day" - English-Spanish dictionary

red-letter day

noun uk /ˌredˈlet.ə ˌdeɪ/ us /ˌredˈlet̬.ɚ ˌdeɪ/

a special, happy, and important day that you will always remember

día memorable
The day I first set foot in America was a red-letter day for me.

(Translation of “red-letter day” from the Cambridge English-Spanish Dictionary © Cambridge University Press)