This adds the function getPubDate() to book.php, which

returns either the publication year, or "", if the value is null or
"Undefined". By "Undefined", I mean the value Calibre sets as pubdate when
you choose "Undefined" in the GUI. which is 1 Jan 0100, or -58979926800.

bookdetail.php

@@ -87,6 +87,15 @@ $book->getLinkArray ();
             </div>
             <?php echo str_format (localize ("content.series.data"), $book->seriesIndex, htmlspecialchars ($serie->name)) ?>
         </div>
+<?php
+        }
+	if ($book->getPubDate() != "")
+	{
+?>
+        <div class="entrySection">
+            <span><?php echo localize("pubdate.title") ?></span>
+            <?php echo $book->getPubDate() ?>
+        </div>
 <?php
         }
 ?>