Custom X-Axis


I have a string variable that contains the time a user is connected to one system, and I need to create a custom graphic that has in the X-Axis this time, but not all the data that I have saved, just the information I choose, for example I would like to omit such data 00:06:13, 00:05:18, 00:05:23
I want something like this:

thanks in advance.

You should be able to customize appearance of these labels with some date-focused settings in Settings: