Sankatahara Chaturthi in August 2017 is known as Maha Sankashti or Maha Sankata Nivarana Chaturthi. Sankata Chavithi that falls before a fortnight (15 days) of Ganesh Chaturthi is very auspicious to worship Lord Ganesha. Maha Sankashti 2017 date is August 11, Friday.
It falls on Bhadrapada Krishna Chaturthi in North Indian Hindi calendars whereas in Shravana Masa Krishna Paksha in Marathi, Gujarati, Kannada, and Telugu Panchangam. Chandrodayam Time (Moonrise Timings) on 11 August is – 9.44 PM.
This Sankashti Chaturthi falls in Karkidaka Masam of Malayalam calendar, Aadi Masam of Tamil Panchangam and Shraban Month in Bengali Panjika.
Sankashti August 2017 Moonrise timings for all cities in India is given here.