program.py

# part solution to http://stackoverflow.com/questions/41447277/trouble-using-pandas-read-html/41447560#41447560
max_value = [0,0]
for item in [(int(val.split('/')[0]), int(val.split('/')[1])) for val in df['Date Posted'].values]:
    if item[0] > max_value[0]:
        max_value[0] = item[0]
    elif item[0] == max_value[0]:
        if item[1] > max_value[1]:
            max_value[1] = item[1]
            
max_date_posted = str(max_value[0]) + '/' + str(max_value[1])

df[df['Date Posted'] == max_date_posted]