The difference between 'on time' and 'in time':

'On time' means being punctual, e.g. 'I arrived at the meeting on time' (if the meeting is at 17h then you pretty much arrived at that time). 'In time' means any time before the start time of an action, e.g. 'she got to the train station in time for her train to Milan' (she could have arrived 1 min, 5 mins, 15 mins etc before the scheduled departure of the train). This error is not confined to our Spanish English as a second language students. Students whose first language is not Spanish will have this issue.