Calendar day

Calendar Day is a term used to refer to a specific 24-hour period in the calendar. This term is often used in contrast to a business day or a working day, which may vary based on local customs, holidays, and business practices.

Definition

A calendar day is defined as a period of 24 hours from midnight to midnight. This is the most common understanding of a day in the Gregorian calendar, which is the calendar system most widely used today.

Usage

The term "calendar day" is often used in legal, business, and administrative contexts to specify a period of time without regard to working hours or days. For example, a law might specify that a certain action must be taken within 10 calendar days, meaning that weekends and holidays are included in the count.

Variations

While the concept of a calendar day as a 24-hour period is widely accepted, there are variations in how this period is defined. For example, in some cultures and calendar systems, a day might be considered to start at sunset rather than midnight. This is the case in the Islamic calendar and the Jewish calendar.

See also

• Business day
• Working day
• Gregorian calendar
• Islamic calendar
• Jewish calendar