Qual a diferença entre IN TIME ou ON TIME?

As expressões On time, in time, e just in time são usadas para se referir a tempo.  Vamos conferir seus usos em conversações:

Exemplos:
Aqui você pode ouvir o transcript fpara mais detalhes\;

On time:

• I am usually on time for work. I am usually not late for work.
• I hope the meeting starts on time.
• Do you think the train will come on time today?

Late:

• Jack was late for work. Jack was not on time for work.
• Dale said the meeting started late this morning.
• Do you think the train will come late today?

In time:

• I arrived at the office in time for the meeting. I arrived before the meeting started.
• I hope we can get to the station in time for the express train.
• Even though there was traffic, I was in time for the movie.

Just in time:

• I arrived at the office just in time for the meeting. I was almost late.
• We got to the station just in time for the express train.
• Because there was a lot of traffic, I was just in time for the movie.

http://www.myhappyenglish.com/2014/12/28/209-on-time-vs-in-time-vs-just-in-time-english-grammar-lesson/?mc_cid=fa7ea5e78a&mc_eid=704c3c7dde