Chart from Date, Time, Temperature and Humidity

I have data from a temperature sensor that I want to create a chart from.

The data is: Date,Time,Temperature_Celsius,Relative_Humidity(%), and it arrives as a .csv file.

If it's just a single date, then I can easily produce a line chart by ignoring the date column.

However the data will likely be for several days at a time.

So how do I create a line chart with the date and time as one value on the x-axis? If I can do that, the values on the y-axis will not be a problem.

I think it could be done by combining data and time into a single value, but I can't find how to do that, and then format the x-axis so it shows each day separately with the times as minor values.

Here's some of the data: