old style calendar

Noun old style calendar has 1 sense

• old style calendar(n = noun.time) julian calendar - the solar calendar introduced in Rome in 46 b.c. by Julius Caesar and slightly modified by Augustus, establishing the 12-month year of 365 days with each 4th year having 366 days and the months having 31 or 30 days except for February; Array
is a kind of solar calendar