A calendar day is a subset meaning of day, relating to any day of the week, month or year. It contrasts the weekday, which usually means any day of the week except the weekend days, which in most parts of the world are Saturday, Sunday or both. Consequently, two weeks may consist of 10 or 12 weekdays depending on local usage of the term weekday, b...
The 24 hour day as denoted on the calendar.
[n] - a day reckoned from midnight to midnight
civil day noun a day reckoned from midnight to midnight