We are following the Tithi of Amavasya according to Calgary Tithi.
Amavasya Tithi Begins = 12:43 on 18/Oct/2017 Amavasya Tithi Ends = 13:11 on 19/Oct/2017
Devotees can observe fasting on 18th October starting at 12:43PM.
For more info please visit the bellowing website.
http://www.drikpanchang.com/diwali/kali-puja/bengal-kalipuja-date-time.html?l=2286&year=2017