kalendermånad

Kalendermånad (calendar month) is a unit of time used in civil calendars. It denotes the interval from the first day to the last day of a given month in the Gregorian calendar. The term is common in Swedish and Norwegian and is often used in English-language texts as calendar month.

Lengths vary by month: February has 28 days in common years and 29 in leap years; January, March, May, July, August, October, and December have 31 days; April, June, September, and November have 30 days.

Kalendermånads are used in dating, finance, statistics, planning, and administration. Data are typically reported by calendar month (for example, January 2024) and can be compared across months, quarters, or years. This unit reflects the civil calendar and is distinct from other month concepts based on lunar cycles or specific fiscal or meteorological schemes.

Related concepts include the lunar month (synodic month), which is about 29.53 days and does not align to calendar months, and fixed or operational months used in meteorology or accounting, which may group days differently for statistical or financial purposes.

Etymology and usage: the word combines kalendar (calendar) and månad (month). In Nordic languages, forms such as kalendermåned or kalendermånad are used, but the underlying meaning remains the standard civil month used for dating and reporting across administrative, business, and statistical contexts.