The tagline comment is an automatically generated header comment by design which contains the version of the formatter and time of formatting the way the script displayed.
There is an option to turn this off if you do the following:
1. in you current script tab, click on the middle top button that has the arrow down.....arrow down to expand the window.
2. Now uncheck the Header for Script options.
To view the timpstamp of when a script is modified or created, please use the Properties tab instead of the Script tab.