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The Gregorian calendar has the same months and month lengths as the Julian calendar, but, in the Gregorian calendar, year numbers evenly divisible by 100 are not leap years, except that those evenly divisible by 400 remain leap years (even then, the Gregorian calendar diverges from astronomical observations by one day ...

By any criterion, the Gregorian calendar is substantially more accurate than the 1 day in 128 years error of the Julian calendar (average year 365.25 days).

Where appropriate, the regional or historical group (Jewish calendar, Hijri calendar, Sikh, Mayan, Aztecan, Egyptian, Mesopotamian, Iranian, Hindu, Buddhist, Pre-Columbian Mesoamerican, Hellenic, Julian or Gregorian-derived) is noted. Calendars fall into four types: lunisolar, solar, lunar and seasonal.

There are three major types of calendar that have been used through history ? solar, lunar and luni-solar. Sidereal (star) calendars have also been used, notably by the ancient Egyptians. Often more than one type of calendar is in use by a given society at the same time.

The months and length of months in the Gregorian calendar are the same as for the Julian calendar. The only difference is that the Gregorian reform omitted a leap day in three centurial years every 400 years and left the leap day unchanged.

In Iran and Afghanistan, the official calendar is the Solar Hijri calendar, also known as the Iranian or Persian Calendar. It is based on astronomical observations of the Sun and is the most accurate calendar in the world.

Some Orthodox churches, like the Orthodox Church in Russia, still use the Julian Calendar today to calculate the dates of moveable feasts. Others who still use the "Old Style" calendar include the Berber people of North Africa and on Mount Athos.

The months and length of months in the Gregorian calendar are the same as for the Julian calendar. The only difference is that the Gregorian reform omitted a leap day in three centurial years every 400 years and left the leap day unchanged.