All Nikko Pass: start of validity period

Dear all,
I am interested in buying a Nikko pass at the Tobu Sightseeing in Asakusa. Do you know if it is required to write on it the first day of use when the ticket is picked up at Tobu offices? On the contrary, does the validity period start when the ticket is used for the first time? Thank you.

The all nikko pass has a stamp on it, I think you can indicate which date you want to use it on, so you buy it on a Monday but you want to use it on a tuesday, I think they can stamp it for you. The validity is whatever the date is on the stamp.

Rather then a stamp, I think the start date is just written on it. Either case I think you can indicate which date you want to use it on, and whatever date it is is when it is the validity.

start of validity is only 30 days before the date of reservation.