Chaturdashi Vrata is observed on the fourteenth during the waxing and waning phase of a lunar month as per traditional Hindu calendar. The Vrata on the day is dedicated to Lord Shiva. Some devotees observe this Vrata in the Shukla Paksha (waxing phase of moon) in Kartik month and observe it then for a year. The Vrata is also observed on the 14th day during the Magh month. This Vrata in Magha month is known as Fala Chaturdashi Vrata.
The result of observing the Vrata is peace and prosperity in worldly life.
During the Chaturdashi falling during the Krishna Paksha (waning phase) of Kartik month God Indra is worshipped by hoisting special flags.
During the Chaturdashi falling during the Shukla Paksha (waxing phase) of Kartik month Ananta as a manifestation of Sri Hari Vishnu is worshipped using Kusha grass.