How to define charts axis interval?

Presently, I'm using a line chart with x-axis of createdDate and y-axis of count of No.of Records on that day.   I'm getting the result like below i.e., in hour format. Because all are created on same date.   My question is how we can define/configure the chart axis to have a interval of some fixed dates. Like I wanna show them with interval of one or two days.   Any suggestions?    
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