adding time?

[rterrien]

Suggest adding convenience functions and example lines showing how to get time values (datetimes, probably?) extracted and plotted if the user wants to plot against time

[Fos314]

There is now a function called convert_time that should take the input of a time array and output the times as an array of datetimes

[rterrien]

Add the needed bits to an example file showing the use of this function as well

[Fos314]

There is now an example notebook showing how convert_time is used and why it is included in the code.