An example of tomorrow is Sunday when today is Saturday.
Origin of tomorrow
- Middle English to morow from Old English tō morgenne in the morning tō at, on to morgenne dative of morgen morning
From American Heritage Dictionary of the English Language, 5th Edition
- From Middle English tomorwe, tomorwen, from Old English tÅmorgen, tÅ morgenne, tÅmergen (“tomorrow", adv), from tÅ (“at, on") + morgene, mergen (dative of morgen (“morning")), from Proto-Germanic *murganaz (“morning"), perhaps, from Proto-Indo-European *mergÊ°- (“to blink, to twinkle"), equivalent to to- +"Ž morrow.