@@ -25 +25 @@
-<gloss>Shōwa- nostalgic</gloss>
+<gloss>Shōwa-nostalgic</gloss>

@@ -18 +17,0 @@
-<xref type="see" seq="1260800">元号・げんごう</xref>

@@ -18,0 +19 @@
+<misc>&hist;</misc>
@@ -25 +26 @@
-<gloss>Shōwa-nostalgic</gloss>
+<gloss>Shōwa- nostalgic</gloss>

@@ -28 +28 @@
-<gloss>old- school</gloss>
+<gloss>old-school</gloss>

@@ -25 +25 @@
-<gloss>Shōwa- nostalgic</gloss>
+<gloss>Shōwa-nostalgic</gloss>

@@ -25 +25 @@
-<gloss>Shōwa-nostalgic</gloss>
+<gloss>Shōwa- nostalgic</gloss>
@@ -28 +28 @@
-<gloss>old-school</gloss>
+<gloss>old- school</gloss>

Hyphenated at most.

@@ -28 +28 @@
-<gloss>oldschool</gloss>
+<gloss>old-school</gloss>

ngrams

昭和な感じ	4506
昭和の感じ	890
(昭和っぽい感じ	330)
平成の感じ	No matches
平成な感じ	No matches
大正な感じ	36
大正の感じ	No matches
明治な感じ	31
明治の感じ	No matches


http://www.ytv.co.jp/michiura/time/2012/09/post-1308.html
"新・ことば事情
４８２６「昭和な人」"
"電車の中で、
「昭和な人やなー」
という言葉が耳に入ってきました。
「めっちゃ昭和や」
という声も。40代半ばぐらいの、私より少し若いぐらいの人たちのグループでした。ここでの「昭和な」は、
「レトロな」「古風な」「古い」「時代遅れの」
という意味で使われています。ところで、
「明治の人」
という表現は「昭和」になっても使われました。これは、
「一本気な」「頑固な」「古風な」
というような意味で使われていました。その一方で、
「大正の人」
という物言いは、昭和の時期にあったのでしょうかね？あまり耳にしなかったように思うのですが。「大正」は15年弱と期間が短かったから、それほどそういった表現は
定着しなかったのでしょうか？"

https://www.hyogen-gakkai-official.org/pdf/98/98_31-40.pdf
"「昭和の街角」を「昭和な街
角」とすると固有名詞が形容詞的な働
きを持つ。"

Out of the recent 年号's, only 昭和 is frequently used like this.

@@ -20,0 +21,9 @@
+<sense>
+<pos>&adj-na;</pos>
+<misc>&col;</misc>
+<gloss>reminiscent of the Shōwa era</gloss>
+<gloss>Shōwa-nostalgic</gloss>
+<gloss>old-fashioned</gloss>
+<gloss>quaint</gloss>
+<gloss>oldschool</gloss>
+</sense>

Aligning.

@@ -18,2 +18,2 @@
-<gloss>Shōwa era (December 25, 1926-January 7, 1989)</gloss>
-<gloss>Showa era</gloss>
+<xref type="see" seq="1260800">元号・げんごう</xref>
+<gloss>Shōwa era (1926.12.25-1989.1.7)</gloss>

I'll reject this addition and the others based on Jim's comment on the "sometimes as ㍍" suggestion for the メートル entry: 
"Those odd Unicode glyphs cause heaps of problems. I'm still ducking."

Let's decide how we want to format era/period dates on the mailing list.

@@ -9,3 +8,0 @@
-</k_ele>
-<k_ele>
-<keb>㍼</keb>

・ isn't　[環境依存] either.

We didn't include ㍍ as a kanji for the メートル entry (and that character doesn't even have a [環境依存] tag in my IME, unlike these 
guys).

Robin (in a rejected branch): "㍼ is not a kanji character. I don't think it should be included.
Regarding date formats, could we maybe make an exception for eras? To me, 1912.7.30-1926.12.25 looks far better."

I've taken the date format thing up on the mailing list.

It was my impression that some other Unicode characters often used in Japanese writing also got a pass, like ・. Is that not the case?

There's one for 平成　too: ㍻. But my IME says 環境依存 like it does for smileys and certain other symbols. I don't think this is a kanji.

https://en.wiktionary.org/wiki/昭和#Alternative_forms

@@ -8,0 +9,3 @@
+</k_ele>
+<k_ele>
+<keb>㍼</keb>

The XXXX.XX.XX format makes sense when it's two dates, but this is current policy.

@@ -18 +18 @@
-<gloss>Shōwa era (1926.12.25-1989.1.7)</gloss>
+<gloss>Shōwa era (December 25, 1926-January 7, 1989)</gloss>

OK

better this way I think

@@ -18 +18,2 @@
-<gloss>Shōwa era (1926.12.25-1989.1.7) (Showa)</gloss>
+<gloss>Shōwa era (1926.12.25-1989.1.7)</gloss>
+<gloss>Showa era</gloss>

Maybe we can make it "Shōwa" with a (Showa) at the end?

we have 8 entries that contain 昭和 / Showa.
They all use the form Showa.
Should we leave them as they are?

I think we can, but maybe add the plain version for reverse searches.)

@@ -18 +18 @@
-<gloss>Showa era (1926.12.25-1989.1.7)</gloss>
+<gloss>Shōwa era (1926.12.25-1989.1.7) (Showa)</gloss>

Should we use macron in the modern era names Taisho and Showa?