is の所は、has been になっていて、
It has been (時間) since SV. でも同じです。

It has passed じゃダメなんですか？

ダメです
pass をつかうなら、(時間)が主語になって
(時間) have passed since SV.になります

書き換えあるある
It is five years since he died.
It has been five years since he died.
Five years have passed since he died.
He has been dead for five years.
He died five years ago.