Adding data label and editing x-axis label

[AS000]

Hi, I'm creating a tidal graph using a line graph and have two quick questions on data/axis labels...

Question 1- How to add the time to the data labels, so it displays the height (column B) & time (column C) for each point stacked on a new line? It's currently automatically displaying only the height.

Question 2 - How to only show the date along the x-axis (column A)? It's currently automatically displaying the time & date.

This is what the data looks like...

Any help would be great!!

Thanks.