Suggested names to save time. Some are already in use which leads me to believe I’m onto something.

DayMorningAfternoonEvening
TodayTomornTonoonTonight
YesterdayLast-mornLast-noonLast night
TomorrowTommornTomnoonTomnight
MondayMomornMonoonMonight
TuesdayTumornTunoonTunight(†)
WednesdayWemornWenoonWenight
ThursdayThmornThnoonThnight
FridayFrimornFrinoonFrinight(‡)
SaturdaySatmornSatnoonSatnight
SundaySumornSumornSunight

(†) Similar to Tonight. It’s all in the inflection.

(‡) Don’t confuse with the 1985 classic vampire move Fright Night or the gastronomic “Fry night”.

Examples:

  • “Hey Julie. So glad it’s Frinoon. Do you want to go to the movies Tomnight?”
  • “Last Thmorn I had coffee with my Dad.”

The major obstacle to this new nomenclature are today’s spell checkers. All will have to be reconfigured.