Suppose my brother's school is closed today (for some reason). I knew it and he did too. But he forgot it and left for school. After that I say this to our mother:
I'm too late to remind him his school is closed today.
I'm too late to have reminded him his school is closed today.
I was too late to remind him his school is closed today.
I was too late to have reminded him his school is closed today.
Which is correct in the context?