matplotlib cannot verify the order of time series

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I was plotting some time series chart through matplotlib in python,but unfortunately it seems to be the wrong time series on the x axis,I was wondering what to do for this issue to make the chart show the time by right order?By the way,the three lines in different colors were from three different list due to the task request,not because I dont wanna gather it into a list by the right order before I draw the chart.