The cryptocurrencies market operates round the clock and round the year, meaning it is a 24 hour a day, seven day a week market. This being said and though you can trade at any time, some hours are better than others for trading purposes since they offer both increased volatility and increased liquidity. At such times, trading is riskier but also comes with a higher profit potential. An example of such time, where increased volatility is often experienced, is at 12pm UK time, when both the UK and US markets are available for trading.