How do I get the time value from text file?

I've prompted the user to select a text file. On the third line of the file is some text ("This is the time") followed by a colon and a couple of spaces. After those space is a date in the format of YYYY, MM, DD, HH:MM:SS.

As it stands now, I'm able to store the name of the file and its path, which is outside of the MATLAB directory. Experimenting with textscan delimiters didn't seem to work...

How can I get MATLAB version 2018a to pull that value of time so I can perform operations with it?

[KSSV]

Attach your text file..so that we can help you..