file = 'info.csv'
data = open(file,'r')
reader = csv.reader(data)

header = next(reader)

for row in reader:
	date = datetime.strptime(row[0], '%Y-%m-%d %H:%M:%S+%f')
#outputs like
#2020-03-29 05:01:28.030000
#2020-03-28 09:48:25.020000
#2020-03-29 17:05:29.030000
#2020-03-29 06:06:16.030000
#2020-03-29 05:57:07.030000

	myformat = "%Y-%m-%d"
	dates = date.strftime(myformat)
#after that outputs like
#2020-03-29
#2020-03-28
#2020-03-29
#2020-03-29
#2020-03-29
	print(set(dates))
#and after that i want to get unique values so i convert it to set, output:
#{'2', '3', '0', '9', '-'}
#{'2', '3', '0', '9', '-'}
#{'2', '3', '0', '9', '-'}
#{'2', '3', '0', '9', '-'}