I'm a bit confused about something: when using the present perfect/past perfect, am I to use "was" or "is" in the main clause?
That day was the most romantic thing that had ever happened to me.
That day was the most romantic thing that has ever happened to me.
That day is the most romantic thing that has ever happened to me.
Are all three of the above sentences grammatically correct? And, what's the difference in their meaning? And, to be clear, I'm not asking for proofreading, I'm just trying to make concepts clear. :)