data = Import["~/data.csv", {"Data", All, {1, 2, 3, 7}}];
dt = Table[{
    Quantity[
     UnixTime[FromDateString[data[[i, 1]] <> " " <> data[[i, 2]]]], 
     "Seconds"],
    Quantity[data[[i, 3]], "Hertz"],
    data[[i, 4]]
    }, {i, Length[data]}
   ];

(* Define custom tick functions *)
xTicks = Charting`ScaledTicks[{Identity, 
     QuantityMagnitude[Quantity[#, "Seconds"]] &}];
yTicks = Charting`ScaledTicks[{QuantityMagnitude, Identity}];

ListDensityPlot[dt, ImageSize -> Large, 
 FrameTicks -> {{yTicks, None}, {xTicks, None}}, 
 FrameLabel -> {"Frequency", "Time"}, 
 LabelStyle -> Directive[FontSize -> 12], 
 PlotLabel -> "Density Plot of RTL Power Data"]

In this code:

1. xTicks and yTicks are custom tick functions that format the ticks on the X and Y axes, respectively.
2. ChartingScaledTicks` is used to create custom ticks that handle the conversion between Unix
3. timestamps and date strings and between Hertz and numerical values.
4. FrameTicks option is used to specify the custom tick functions for the X and Y axes.
5. FrameLabel is used to add labels to the axes.
6. LabelStyle is used to set the font size for the axis labels.
7. PlotLabel is used to add a title to the plot.

This configuration should format the X and Y axes according to your requirements. Adjust the LabelStyle and other formatting options as needed to match your desired visual style. I hope that helps you