# How many years in this context relating to the word "relative to"?

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?

• 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. May 28, 2021 at 7:13
• 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? May 28, 2021 at 7:15
• If the event lasted a year, and there are 7 years surrounding it, then yes, the total time period is 8 years. May 28, 2021 at 7:35
• Does this answer your question? Prepositions of time ranges including or excluding the endpoints of the range. Also Is “until” inclusive or exclusive?, which is essentially about the same issue. May 28, 2021 at 13:23
• 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. May 28, 2021 at 16:05