difference between "in" and "during"

[Harry_Ph]

What is the difference between "in" and "during"?

For example:
In 1990-1995, he was with the Philippine Military Academy.
During 1990-1995, he was with the Philippine Military Academy.

It appears to me that "in" is synonymous with "within a given period," while "during" involves duration.

I would appreciate if anybody can share his/her own idea(s) on this matter.
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The more we learn, the less we seem to know.

[Mister Micawber]

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Well, for one thing, the hyphen is read as 'to' or 'through', so neither preposition really works for me. In the following phrases, there is no necessary difference in meaning between the two: 'in 1990 he was at the academy' vs 'during 1990 he was at the academy'. We are still left wondering whether he was there for the entire year. I do agree that 'during' speaks more to duration (they have the same root, after all).
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Native English teacher at Mister Micawber's

[Harry_Ph]

I see. Thank you, Mister Micawber. I am asking this question because I once encountered an author who wanted to change the "in" phrase to its "during" equivalent in his paper. But since I could not find a strong argument that the "in" phrase also works, I just allowed what he would like to happen, i.e., to use the "during" phrase.
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The more we learn, the less we seem to know.

[Mister Micawber]

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That was very diplomatic of you.
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Native English teacher at Mister Micawber's

[Harry_Ph]

:) I don't know whether to take what you said as a compliment or not. But still, thank you, Mister Micawber. Have a nice day! :)
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The more we learn, the less we seem to know.

[Mister Micawber]

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A compliment, definitely.
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Native English teacher at Mister Micawber's

[Harry_Ph]

Thanks, Mister Micawber. Until next time... :)
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The more we learn, the less we seem to know.