The Romans added January and February to the calendar but ran into a problem — math and superstition. Here's why February became the odd month out.

This beautiful East African country follows its own unique calendar, which has 13 months in a year. While most of the world uses the Gregorian calendar, Ethiopia sticks to the Ethiopian calendar ...

Gregorian or English calendar was born after the Julian calendar ... Here is a brief description of the Baha'i calendar. It comprises 19 months of 19 days each, with the addition of intercalary ...

called the Gregorian calendar, based on the solar year. A lunar year contains 12 lunar months, which are based on the time it takes the moon to go around the Earth. Twelve lunar months are equal ...