英文 on / in / by

001 的答案是錯的！只要查查字典看便請楚了。
- 凡是講年份/月份的，請用 "in" ，如：His birthday is in May./ The Second World War ended in 1945.
- 凡是講日子的請用，請用 "on" ，如：The school year begins on 1 September each year.
- 凡是指定某時間的請用 "at"，如：I woke up at 8:00am this morning.

另外，"by"是用以帶出一個限期的，例如： The work is expected to complete by the end of March. (這工程預計三月底前完成。）

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This booklet is printed in January

This booklet is printed in January = correct
It was printed in January = past tense ( we are in March now)
The booklet will be printed in January = futuure tense

The booklet will be printed by the end of January or by January =It means the deadline for printing this booklet is January or the booklet will be printed no later than January.

This booklet is printed in January.

For month, you must use in. For date, you use on (e.g on January 3. 2010).

However, there is grammatically mistake. You should not use present tense in this sentence, the correct forms may either be one of the followings :-

This booklet was printed in January. (To indicate something happened in the past.)

This booklet is to be printed (or will be printed) in January. (To indicate a schedule).

The third sentence has different meaing. It indicates a deadline that needs to be complied with.

在 Time Preposition 來講，就你以上句子，用 ON 是正確的！ON 是用於連接月份，IN 是用於 年份，而 BY 是用在連接某一個時間裡，例如：This juice has to be used BY 17 March.

希望你明白。

2010-03-11 11:29:33 補充：
003 Michael 的答案是正確的！