Janmashtami is in the year 2017 on August 14th.

According to Hindu religion, Lord Vishnu's full moon is considered as Lord Krishna and he is worshiped. It is believed that Lord Krishna has passed through all the chakras of human life (i.e. birth, death, mourning, happiness etc.), that is why they are called full-moon. According to the future Purana, Lord Krishna was born in the Rohini Nakshatra on the midnight of Ashtami (Janmashtami) on the Krishna side of Bhadrapad month. Janmashtami (About Janmashtami in Hindi) The birth anniversary of Lord Shri Krishna is celebrated as Janmashtami. 

Click for full story of Janmashtami and Krishna birth: Krishna Janam Katha Lord Krishna was born in Devaki and Vasudev, but he was raised by mother Yashoda and Nandababa. In the whole of India, including Mathura this Maha Parv celebrates with joy. Dahi Handi on Janmashtami Lord Krishna was naughty and mischievous since childhood. Makhan was very dear to him whom he used to steal from the matki. This leela of Lord Krishna is recreated on his birth anniversary. In many parts of the country, this day is also organized for the eradication of mockery. The ceremony of breaking a yogurt-honey or junk that has become the identity of Janmashtami festival, rejuvenates Lord Krishna's memories in the hearts of devotees. Janmashtami Puja Vidhi On Janmashtami, devotees should keep fast during the day and at 11 o'clock in the evening, holy, in the holy room of the house, on the throne of common wood on the east side, by wearing red clothes, setting up a picture of Radha-Krishna on it. After this, according to the scriptures, he should worship Nandlal before it.