[€uroMeinke]

Hmmm so I tried plugging the number into excel and I got the 2031 date, the star date converter took me back to 1983, the string "340209 - 25" in google brought me to fiat, so now I shall look at this as a Mouse Adventure puzzle:

First the math:

340209-25=340184

Now, if I do a simple alpabet replacement such as:

0123456789
ABCDEFGHIJ

the number 340184 becomes DEABIE

Which is an anagram of DIE ABE

An obvious reference to the Main Street Opera House, where good ol' Honest Abe's animatronic self continued to deliver his words of wisdome long after his death.

We are obviously meeting outside the Opera House.