30 July 2018 is First Shravan Somvar in North Indian Hindi calendars. In Marathi, Gujarati, Telugu and Kannada calendars, it is on 13 August. And in Nepali calendar, first Shravan Somvar Vrat date is July 23.
30 July falls on Krishna Paksha Tritiya in Shravan Month as per North Indian Hindi calendars; in Ashada Month as per Purnimant Panchangams. 13 August falls on Shukla Paksha Dwitiya in Shravan Month as per all Hindu calendars.
In North Indian calendars, Shravan Month begins on July 28 and ends on and ends on August 26.
As per Telugu, Kannada, Marathi & Gujarati calendars, Shravan Maas 2018 begins on 12 August and ends on September 9.