Implement getUploadDate() in YouTubeStreamInfoItemExtractor

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeChannelExtractor.java

@@ -164,11 +164,9 @@ public class YoutubeChannelExtractor extends ChannelExtractor {
 
     @Override
     public long getSubscriberCount() throws ParsingException {
-
         final JsonObject subscriberInfo = initialData.getObject("header").getObject("c4TabbedHeaderRenderer").getObject("subscriberCountText");
         if (subscriberInfo != null) {
             try {
-
                 return Utils.mixedNumberWordToLong(subscriberInfo.getArray("runs").getObject(0).getString("text"));
             } catch (NumberFormatException e) {
                 throw new ParsingException("Could not get subscriber count", e);

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java

@@ -512,7 +512,6 @@ public class YoutubeStreamExtractor extends StreamExtractor {
         }
     }
 
-
     @Override
     public StreamInfoItemsCollector getRelatedStreams() throws ExtractionException {
         assertPageFetched();
@@ -678,7 +677,6 @@ public class YoutubeStreamExtractor extends StreamExtractor {
         }
     }
 
-
     @Nonnull
     private EmbeddedInfo getEmbeddedInfo() throws ParsingException, ReCaptchaException {
         try {

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamInfoItemExtractor.java

@@ -158,12 +158,26 @@ public class YoutubeStreamInfoItemExtractor implements StreamInfoItemExtractor {
     @Override
     public String getTextualUploadDate() {
         // TODO: Get upload date in case of a videoRenderer (not available in case of a compactVideoRenderer)
-        return null;
+        try {
+            String s =videoInfo.getObject("publishedTimeText").getString("simpleText");
+            return s;
+        } catch (Exception e) {
+            // upload date is not always available, e.g. in playlists
+            return null;
+        }
     }
 
     @Nullable
     @Override
-    public DateWrapper getUploadDate() {
+    public DateWrapper getUploadDate() throws ParsingException {
+        String textualUploadDate = getTextualUploadDate();
+        if (timeAgoParser != null && textualUploadDate != null && !textualUploadDate.isEmpty()) {
+            try {
+                return timeAgoParser.parse(textualUploadDate);
+            } catch (ParsingException e) {
+                throw new ParsingException("Could not get upload date", e);
+            }
+        }
         return null;
     }