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Today, when discussing this topic, I saw a comment

By "7 years surrounding the event" they mean the effects in the 2 years before and the 5 years after the event date. The periods are "relative to" the first adoption year.

I am wondering whether the commenter said that "7 years surrounding the event" is 8 years, including two years before, 5 years after, and the event year?

Phil Nguyen
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    Surely, it would only mean 8 years if the 'event' referred to lasted for a whole year? Otherwise, 'the two years before' is the 24 months ending on the day of the event. – Kate Bunting May 28 '21 at 07:13
  • The event is referred to lasted for a whole year in this case. So, you mean, in this case, it would be 8 years in total? – Phil Nguyen May 28 '21 at 07:15
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    If the event lasted a year, and there are 7 years surrounding it, then yes, the total time period is 8 years. – E.Aigle May 28 '21 at 07:35
  • Does this answer your question? [Prepositions of time ranges including or excluding the endpoints of the range.](https://ell.stackexchange.com/questions/276017/prepositions-of-time-ranges-including-or-excluding-the-endpoints-of-the-range) Also [Is “until” inclusive or exclusive?](https://ell.stackexchange.com/questions/33340/is-until-inclusive-or-exclusive), which is essentially about the same issue. – FumbleFingers May 28 '21 at 13:23
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    What event was it that lasted exactly one year? If that is not the case then @KateBunting comment is the answer. The whole thing is ambiguous without more context. – mdewey May 28 '21 at 16:05
  • @mdewey this is an event study, and regarding imposing a law, we use the year that the law was implemented to be the event year. That's why it is called event year, not event date. – Phil Nguyen May 30 '21 at 20:52

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