The long day candlestick pattern (view full size chart) is one of the single candlestick patterns (i.e. it consists of only one candlestick), and by itself it is not really a bullish or bearish pattern (even though it consists of primarily bullish or bearish trading).
The long day candlestick opens and closes outside of the previous candlestick's range (i.e. above its high and below its low), thereby completely containing the previous candlestick within its length. The long day pattern is either bullish or bearish, depending upon whether the time frame consisted of primarily bullish or bearish trading.
Note that the long day candlestick pattern is so named because it has a long candlestick length (i.e. a large range), not because it is associated with a long trade.
Use In Trading
The long day pattern can occur in a number of different contexts (e.g. at the beginning of a trend, during a trend, at the end of a trend, etc.), and by itself it only indicates that the time frame was bullish or bearish. Therefore, the long day is not often used as an trade entry or exit pattern. The long day is also included in some of the two or three candlestick patterns, in which case it has more relevance, and can provide an indication of upcoming price movement.
