132 survy assessment limitation date

1. The survey will be conducted u/s 132 and BOA will be demanded u/s 132A. 
2. Sec 143(2) notice should be served within 6 months from the FY in which the ROI is filed. 
3. In your case, ROI would have been filed during the FY 2018-19. Within 6 months from 31.03.2019 will be 31.12.2019. Hence, notice should be served within 31.12.2019 as explained by experts above. 
Please correct me if the above solution has an alternative view.