difference between "in time" and "on time"

source: learnexmumbai
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# On time:
Doing something "on time" means meeting an appointment, or meeting a time that has been set by someone.
For example:
I hardly ever get to work on time.
Peter wants to start the meeting on time.
# In time:
Doing something "in time" means doing it before a deadline, or doing it before it becomes unavailable.
For Example:
The ambulance arrived just in time at the accident spot.
If you don't submit your project in time, you will be fired.