In case anybody is curious about the claim that October 23 is too late, I updated the Wikipedia page listing the past debates to include the date.
https://en.wikipedia.org/wiki/United_States_presidential_debates
In general, the first debate takes place in late September or early October, and the final debate occurs in mid to late October with two or three debates being the norm. The first debate occurring in June is new this year as the debates normally start after the nominations are complete.
So, unsurprisingly, Trump’s argument has no historical basis and complaining that the debate is too close to the election is nonsense.
From the wiki, the idea comes from an essay that somebody has written about a conversation they had with a friend about the struggles of chronic illness. The conversation took place at a restaurant, and she grabbed the spoons for use in a metaphor because there were spoons nearby. She gave her friend a set of spoons, and every time her friend mentioned doing a task, she took a spoon away.
It could have been anything, but spoons happened to be at hand and she wanted to make a physical representation of an abstract concept. The essay resonated with people, so spoons became entrenched. And now I hear people say that they’re all out of spoons to express the idea that they’ve done all that they can that day.