on time和in time的含义和用法不同，in time的意思是及时，on time的意思为准时。in time翻译成中文有"及时、迟早"的意思，具体是指正赶上时候或恰好在需要的时候完成了某事；on time翻译成中文有"准时、按时"的意思，具体是指按照规定的时间完成了某事。

You barely got the rest of us here in time.

你仅仅能够及时把我们其他人带到这里。

If you want much more information, get in touch with them in time.

如果你想得到更多的信息请与他们及时联系。

In time, though,he is going to understand;so,if you need to,give him his space.

经过一段时间以后，他就会开始理解了。因此，如果可以的话，给他点儿空间

Can we arrive in Beijing on time or not?

我们能否按时到达北京?

Thanks to our hard work,we can fulfil the task on time.

托赖大家的努力，才能按时完成任务。

You will all have to come on time;I can except no one.

你们都要准时来，谁也不能除外。