Karthikai,Kartika, Karthika or Kartik (Bengali: কার্তিক Kartik, Hindi: कार्तिक Kārtika, Kannada: ಕಾರ್ತಿಕ, Odia: କାର୍ତ୍ତିକ, Marathi: कार्तिक, Nepali: कार्त्तिक, Sanskrit: कार्तिकः,Telugu: కార్తీకం, Tamil: கார்த்திகை), is a Hinduism coined month of Bengali (7th month), Tamil (8th month) and Nepali calendar(7th month), named after the Hindu god, Kartikeya.
In the lunar Hindu calendar, Kartika begins with the new moon in November and is the eighth month of the year except in Gujarat, where it marks the new year that falls on Diwali. In the solar calendar used in Tamil Nadu, Karthikai begins with the Sun's entry into Scorpio and is the eighth month of the year.
In the Vaishnava calendar, Damodara governs this month.
In the reformed Indian national civil calendar, Kartika is the eighth month of the year. It corresponds with the months of October/November in the Gregorian Calendar
Kartika (কার্ত্তিক) is the seventh month of the Bengali Calendar. It begins in mid-October of the Gregorian calendar. The name of the month is derived from the name of the star Krittika (কৃত্তিকা). It marks the start of the dry season (হেমন্ত Hemôntô).