it is the first time +现在完成时
----------it is the first time that I have seen a tiger.
it was the first time+过去完成时
-----------It was the first time that he had said ( that )he loved me.
it is the first time +现在完成时
----------it is the first time that I have seen a tiger.
it was the first time+过去完成时
-----------It was the first time that he had said ( that )he loved me.