Fix For "BSD 'date' does not have the -R option"

modified date calls on lines 514, 515, 531, and 628 to use
+"%a, %d %b %Y %H:%M:%S %z"
in place of
-R
for compatibility with BSD systems.

This commit has not been tested, but should work.

bb.sh

@@ -511,8 +511,8 @@ make_rss() {
     echo '<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/">' >> "$rssfile"
     echo '<channel><title>'$global_title'</title><link>'$global_url'</link>' >> "$rssfile"
     echo '<description>'$global_description'</description><language>en</language>' >> "$rssfile"
-    echo '<lastBuildDate>'$(date -R)'</lastBuildDate>' >> "$rssfile"
-    echo '<pubDate>'$(date -R)'</pubDate>' >> "$rssfile"
+    echo '<lastBuildDate>'$(date +"%a, %d %b %Y %H:%M:%S %z")'</lastBuildDate>' >> "$rssfile"
+    echo '<pubDate>'$(date +"%a, %d %b %Y %H:%M:%S %z")'</pubDate>' >> "$rssfile"
     echo '<atom:link href="'$global_url/$blog_feed'" rel="self" type="application/rss+xml" />' >> "$rssfile"
 
     n=0
@@ -528,7 +528,7 @@ make_rss() {
         echo "]]></description><link>$global_url/$i</link>" >> "$rssfile"
         echo "<guid>$global_url/$i</guid>" >> "$rssfile"
         echo "<dc:creator>$global_author</dc:creator>" >> "$rssfile"
-        echo '<pubDate>'$(date -r "$i" -R)'</pubDate></item>' >> "$rssfile"
+        echo '<pubDate>'$(date -r "$i" +"%a, %d %b %Y %H:%M:%S %z")'</pubDate></item>' >> "$rssfile"
 
         n=$(( $n + 1 ))
     done
@@ -625,7 +625,7 @@ rebuild_all_entries() {
         awk '/<!-- text begin -->/, /<!-- text end -->/{if (!/<!-- text begin -->/ && !/<!-- text end -->/) print}' "$i" >> "$contentfile"
 
         # Original post timestamp
-        timestamp="$(date -R -r $i)"
+        timestamp="$(date -r $i +"%a, %d %b %Y %H:%M:%S %z" )"
 
         create_html_page "$contentfile" "$i.rebuilt" no "$title" "$timestamp"
         # keep the original timestamp!