in time是及时，on time是按时。

in time与on time的区别

in time有”及时;迟早”的意思,意指正赶上时候或恰在需要的时候,或解释为”终有一天;最后”;

on time是”准时;按时”之意。如:

We were just in time to catch the bus.(我们及时赶上了公共汽车)

The train pulled in on time.(火车准时到站了)