Calendar of Harptos

The Calendar of Harptos is the calendar used across Abeir. It was created by the wizard Harptos of Tarmalune. It is split into twelve months, each lasting thirty days. Each month has three ten day weeks called "tendays." The calendar has five extra days added to the end of five months with a leap day every four years, creating a 365.25 day calendar.

Months
The names of the months are as follows:

Hammer is the first month of the calendar. It is one of the five months that have an extra day at the end of it, which is called Midwinter for the festival of the same name held on the same day.

Alturiak is the second month of the calendar.

Ches is the third month of the calendar. On the 19th of Ches is the Spring Equinox.

Tarsakh is the fourth month of the calendar. It is one of the five months that have an extra day at the end of it, which is called Greeengrass for the festival of the same name held on the same day.

Mirtul is the fifth month of the calendar.

Kythorn is the sixth month of the calendar. On the 20th of Kythorn is the Summer Solstice.

Flamerule is the seventh month of the calendar. It is one of the five months that have an extra day at the end of it, which is called Midsummer for the festival of the same name held on the same day. Once every four years it also has a 32nd day called Shieldmeet for the festival of the same name held on the same day.

Eleasias is the eighth month of the calendar.

Eleint is the ninth month of the calendar. The Autumn Equinox is on the 21st of Eleint. It also is one of the five months that have an extra day at the end of it, which is called Highharvestide for the festival of the same name held on the same day.

Marpenoth is the tenth month of the calendar.

Uktar is the eleventh month of the calendar. It also is one of the five months that have an extra day at the end of it, which is called The Feast of the Moon for the festival of the same name held on the same day.

Nightal is the twelfth month of the calendar. The Winter Solstice is on the 20th of Nightal.