An "ordinary day" refers to a normal, average, or typical day without any significant or unusual events happening. It is a day that is mundane or routine. Full definition
I should experience beautiful things even on ordinary days! (theinspiredroom.net)
Generally, counseling deals with ordinary every day problems and issues, while psychotherapy generally deals with deeper mental and emotional problems. (psychology.wikia.com)
Fall festivities are wonderful excuses for spending time with family and making otherwise ordinary days special. (allfreekidscrafts.com)