Update SE identifier to new standards

src/epub/content.opf

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <package xmlns="http://www.idpf.org/2007/opf" dir="ltr" prefix="se: https://standardebooks.org/vocab/1.0" unique-identifier="uid" version="3.0" xml:lang="en-US">
 	<metadata xmlns:dc="http://purl.org/dc/elements/1.1/">
-		<dc:identifier id="uid">url:https://standardebooks.org/ebooks/f-scott-fitzgerald/the-great-gatsby</dc:identifier>
+		<dc:identifier id="uid">https://standardebooks.org/ebooks/f-scott-fitzgerald/the-great-gatsby</dc:identifier>
 		<dc:date>2021-01-01T22:22:26Z</dc:date>
 		<meta property="dcterms:modified">2021-01-01T22:22:26Z</meta>
 		<dc:rights>The source text and artwork in this ebook are believed to be in the United States public domain; that is, they are believed to be free of copyright restrictions in the United States. They may still be copyrighted in other countries, so users located outside of the United States must check their local laws before using this ebook. The creators of, and contributors to, this ebook dedicate their contributions to the worldwide public domain via the terms in the [CC0 1.0 Universal Public Domain Dedication](https://creativecommons.org/publicdomain/zero/1.0/).</dc:rights>

src/epub/css/se.css

@@ -56,6 +56,10 @@ section[epub|type~="colophon"] p + p::before{
 	width: 25%;
 }
 
+section[epub|type~="colophon"] p:nth-last-child(2) time{
+	font-variant: small-caps;
+}
+
 section[epub|type~="colophon"] a{
 	font-variant: small-caps;
 }

src/epub/text/colophon.xhtml

@@ -12,13 +12,13 @@
 				<img alt="The Standard Ebooks logo." src="../images/logo.svg" epub:type="z3998:publisher-logo se:image.color-depth.black-on-transparent"/>
 			</header>
 			<p><i epub:type="se:name.publication.book">The Great Gatsby</i><br/>
-			was published in 1925 by<br/>
+			was published in <time>1925</time> by<br/>
 			<a href="https://en.wikipedia.org/wiki/F._Scott_Fitzgerald"><abbr epub:type="z3998:given-name">F.</abbr> Scott Fitzgerald</a>.</p>
 			<p>This ebook was produced for<br/>
 			<a href="https://standardebooks.org/">Standard Ebooks</a><br/>
 			by<br/>
 			<a href="https://alexcabal.com/">Alex Cabal</a>,<br/>
-			and is based on a transcription produced in 2018 by<br/>
+			and is based on a transcription produced in <time>2018</time> by<br/>
 			<b epub:type="z3998:personal-name">Al Haines</b>, <b epub:type="z3998:personal-name">Cindy Beyer</b>, and <a href="https://www.pgdpcanada.net/">Distributed Proofreaders Canada</a><br/>
 			for<br/>
 			<a href="https://www.fadedpage.com/showbook.php?pid=20181181">Faded Page</a><br/>
@@ -26,14 +26,14 @@
 			<a href="https://archive.org/details/in.ernet.dli.2015.184960">Internet Archive</a>.</p>
 			<p>The cover page is adapted from<br/>
 			<i epub:type="se:name.visual-art.painting">Celestial Eyes</i>,<br/>
-			a painting completed in 1925 by<br/>
+			a painting completed in <time>1925</time> by<br/>
 			<a href="https://en.wikipedia.org/wiki/Francis_Cugat">Francis Cugat</a>.<br/>
 			The cover and title pages feature the<br/>
 			<b epub:type="se:name.visual-art.typeface">League Spartan</b> and <b epub:type="se:name.visual-art.typeface">Sorts Mill Goudy</b><br/>
-			typefaces created in 2014 and 2009 by<br/>
+			typefaces created in <time>2014</time> and <time>2009</time> by<br/>
 			<a href="https://www.theleagueofmoveabletype.com/">The League of Moveable Type</a>.</p>
 			<p>The first edition of this ebook was released on<br/>
-			<b>January 1, 2021, 10:22 <abbr class="eoc">p.m.</abbr></b><br/>
+			<time datetime="2021-01-01T22:22:26Z">January 1, 2021, 10:22 <abbr class="eoc">p.m.</abbr></time><br/>
 			You can check for updates to this ebook, view its revision history, or download it for different ereading systems at<br/>
 			<a href="https://standardebooks.org/ebooks/f-scott-fitzgerald/the-great-gatsby">standardebooks.org/ebooks/f-scott-fitzgerald/the-great-gatsby</a>.</p>
 			<p>The volunteer-driven Standard Ebooks project relies on readers like you to submit typos, corrections, and other improvements. Anyone can contribute at <a href="https://standardebooks.org/">standardebooks.org</a>.</p>