Today (July 21) is “Hand Job Day” in Japan.
You can have a pun on Japanese "Masturbation" in Japanese on "July 21", so there is a reason for this.

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今日の英語助言

手こきは「hand job」です
オナニーは「masturbation」です

助言ありがとうございます。
今回は7月21日が過去に"Hand Job Day"という訳で紹介されたことがあること、"National Masturbation Day"が5月28日に存在することから、"Masturbation Day"ではなく"Hand Job Day"を用いました。

>Kancolle
>Asking what day it is
Nenohi da yo!

Let me guess, it must be like this: 07-21 =0-7-2-1=O-nana-ni-ichi=O-na(na)-ni-i(chi)=o-na-ni-i=onanii=オナニー ?

I'm not actually sure what you're talking about. It's not nearly that complicated. There's just a character in Kancolle named Nenohi, who frequently says, "What day is it today? It's Nenohi!" It's a pun, because Nenohi means New Years Day.
EDIT: Oh, wait, you're talking about the original joke. In that case, why are you replying to me? I was making a completely different joke.

Where can I get this toy?