Will I be able to board on Hikari Shinkansen at Oct, 26 daytime by my 1 week JR Pass if I activate it on Oct, 20?
I'm almost sure that the answer is 'yes', but asking just to confirm - as I'm planning an expensive trip on Oct, 26.
When you activate your pass, they will put a large sticker on it mentioning the first and last days, and yes it is inclusive. The image below shows an activated 7-day JRP valid from 19 to 25 january 2017. That means the owner of this JRP could have used it with no limits including on the 19.01 and 25.01 dates.