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Best Time to buy a stock in a day 
The best thing to do is not worry about what time is best to buy but put in a conditional order before the market opens. If your conditions are met during the trading day your order will go through and you will buy the shares. This keeps your emotions out of your trading and will stop you from either chasing the market or buying when you consider the wrong time. As you have already done your analysis and made your decision before market open, thus you should place your conditional orders and stop losses before market opens as well.