Pendant la journée.
'on this day' in french is 'ce jour-là'
Per day is 'par jour' in French.
To say, "Will you go out with me one day?" in French you say: Sortirez-vous avec moi un jour ?
you say "jour" for day
Jour
Pendant
Canada Day in french is "La fête du Canada"
today was a good day in french
To greet a male professor during the day in French, you can say, "Bonjour, Monsieur [Last Name]." If you are on familiar terms, you might simply say, "Bonjour, Professeur." It's polite to use "Monsieur" or "Professeur" to show respect. A warm smile and a nod can also enhance your greeting.
On that day is "aujourd'hui" (for today) or "en ce jour" (for any day even in the past) in French.
C'etait une longue journee means "it was a long day" in French
You say "nouveau jour"... nouveau = new / jour = day.