NAB bank is it time to buy?

clipped from markets.news.com.au National Aust Bank (NAB) NAB -0.92 21.90 at 04:10 PM High ($A) Low ($A) Open ($A) Volume (Shares) Value ($A) Change (%) 52 Week High 52 Week Low 22.2000 21.5200 21.9500 12,610,617 277,946,711 -4.0316 44.8400 21.5200