Adding the numbers, since they settle part of this. One practical note: write down what you did and when, before you need it. Reconstructing a timeline from memory three months later is how people end up unable to answer the one question that would have resolved it.

A narrower follow-up, since the general answer is now clear:

Was that from a primary source or from a summary of one?

josh_phd_bmore said:

One practical note: write down what you did and when, before you need it.

Worth saying that the confident version of this is more useful to the person writing it than to the person reading it.

josh_phd_bmore said:

One practical note: write down what you did and when, before you need it.

That is right, and it stops being right at the edges. The general case is well behaved; the interesting cases in this thread are all at the boundary where the general case breaks.

I would rather be corrected than agreed with, if it comes to it.

josh_phd_bmore said:

One practical note: write down what you did and when, before you need it.

That reframing is the part I needed. Printing the relevant bit and taking it with me.