I can't give you any meaning or an exact answer for "In the day", but I can for the …
in this day：介词短语,常在句首或句末做时间状语,强调以一天为限,具体做了什么. 如：In this day,we …
总结来说，"in the day"用于描述一天内的不同时间段，而"on the day"则侧重强百度文库某一天的具 …
on Christmas Day/Eve 需要特别注意的是：at，on都可用来表示“节假日”，但at侧重指“休 …
At, on and in (time): typical errors. We use on not at to talk about a particular day: The two couples were married in two different cities …
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