The phrase "calendar days" refers to the total number of days on a calendar, including weekends and holidays, without skipping any days. It is used to measure the time it takes for something to happen. Full definition
Payments to the author are made within forty - five days of the last calendar day of the month in which the book sales were made. (selfpublishingrelief.com)
Either way, remember that the court must have the affidavit within 30 calendar days from when the ticket was issued. (toocooltrafficschool.com)
An average monthly balance sums the closing balance at the end of each day and divides it by the number of calendar days in the month. (investopedia.com)