Sankashti Chaturthi or Sankatahara Ganapathi Chaturthi, the auspicious Ganesha vrata, is observed on Krishna Paksha (Vad paksha / Bahula paksha) in every month.
There is no Sankashti in February 2021. As Sankashti Chaturthi falls on 31 January, next Sankashti is in March 2021. But some calendars mentioned 1 February as Sankashti Chaturthi.
Sankashti March 2021 falls in Falgun month as per North Indian Hindi calendars and in Magha Month in Marathi, Gujarati, Telugu, and Kannada calendars.
Here are the timings of Sankashti Chandrodaya on 12 February 2020 in all cities and towns in Maharashtra (Mumbai, Pune, Thane, Nagpur, Kolhapur, Vardha), North India (Delhi, Akola, Lucknow, Jaipur, Surat, Nathdwara, etc.) and Karnataka (Bengaluru, Mysore, Mangalore, etc.)..