YOU SAID:

When I was there the now was then

INTO JAPANESE

私がそこにいたとき、今は当時だった

BACK INTO ENGLISH

Now was the time when I was there

INTO JAPANESE

今が私がそこにいたときだった

BACK INTO ENGLISH

now was when i was there

INTO JAPANESE

私がそこにいたときは今だった

BACK INTO ENGLISH

it was now when i was there

INTO JAPANESE

私がそこにいたときは今でした

BACK INTO ENGLISH

it was now when i was there