What they said. In time can also mean 'synchronised' - i.e. 'waving his hands in time with the music'.

These people are correct however, In time and on time can be used in sentences like these. In time it will get more hot and then this cold weather will go away. (meaning as time goes by ) I got home just in time to watch the news. (in time in this sentence means just when needed something at a good time) Try to arrive on time. You arrived just in time to watch this movie with me! sit down!

Steve: Yes, these two phrases can be confusing. Maybe some examples might be helpful: ON TIME: 1. The student was punished because he never comes to school ON TIME. (School starts at 8 o'clock. He always walks in at 8:01.) 2. They say that in country X, the trains are always ON TIME. (If the schedule says that it will arrive in city X at 4:05 p.m., then it will arrive at 4:05 -- not 4:03 or 4:06.) IN TIME 3. I was very sick. An ambulance took me to the hospital. The doctor said, "You are very lucky. If you had arrived any later, I could not have saved your life. You arrived just in time." 4. I decided to visit my friend Tom. He did not know that I was coming. When he opened the door and saw me, he said, "Hi, dude! You are just in time for dinner. Come join us for a lobster dinner."

On time means at the planned time; neither late nor early. In time means with enough time to spare; before the last moment. Suppose that you, Shanto, and I were asked to be at the italki headquarters at 9:00 am. If I arrived at 9:00 am, and you arrived at 8:45, I would be said to have arrived ON time, whereas you arrived IN time.

on time = punctual in time = not late