Anyway, I don't think that's going to be particularly helpful for him. Yes, it creates a text list of times at nearly any interval you want. But given that he is looking a jQuery plugins, I suspect he would have no idea at all how to match that up with his chart.
I think he needs to show us what his Gantt chart looks like, first, before we can help him create the kind of interval markers he wants.
An optimist sees the glass as half full.
A pessimist sees the glass as half empty.
A realist drinks it no matter how much there is.