remove alternative date calculation from refresh manager

The current implementation interfers with the new usage of the update date
We may need to restore the behavior that sets the updated date to the newsfeed update date.
That could be a setting on a per-feed basis.

Vienna/Sources/Fetching/RefreshManager.m

@@ -832,28 +832,11 @@ -(void)finalizeFolderRefresh:(NSDictionary *)parameters
     NSMutableArray *articleArray = [NSMutableArray array];
     NSMutableArray *articleGuidArray = [NSMutableArray array];
 
-    NSDate *itemAlternativeDate = newFeed.modificationDate;
-    if (itemAlternativeDate == nil) {
-        itemAlternativeDate = [NSDate date];
-    }
-
     // Parse off items.
 
     for (id<VNAFeedItem> newsItem in newFeed.items) {
-        NSDate * articleDate = newsItem.publicationDate;
-        NSDate * modificationDate = newsItem.modificationDate;
-
-        NSString * articleGuid = newsItem.guid;
 
-
-        // set the article date if it is missing. We'll use the
-        // last modified date of the feed and set each article to be 1 second older than the
-        // previous one. So the array is effectively newest first.
-        if (articleDate == nil) {
-            articleDate = itemAlternativeDate;
-            itemAlternativeDate = [itemAlternativeDate dateByAddingTimeInterval:-1.0];
-        }
-        NSString * articleGuid = [self getOrCalculateArticleGuid:newsItem articleDate:articleDate folderId:folderId articles:articleArray articleGuidArray:articleGuidArray];
+        NSString * articleGuid = [self getOrCalculateArticleGuid:newsItem folderId:folderId articles:articleArray articleGuidArray:articleGuidArray];
         [articleGuidArray addObject:articleGuid];
 
         Article * article = [[Article alloc] initWithGuid:articleGuid];
@@ -878,8 +861,8 @@ -(void)finalizeFolderRefresh:(NSDictionary *)parameters
             articleLink = feedLink;
         }
         article.link = articleLink;
-        article.publicationDate = articleDate;
-        article.lastUpdate = modificationDate;
+        article.publicationDate = newsItem.publicationDate;
+        article.lastUpdate = newsItem.modificationDate;
         NSString * enclosureLink = newsItem.enclosure;
         if ([enclosureLink isNotEqualTo:@""] && ![enclosureLink hasPrefix:@"http:"] && ![enclosureLink hasPrefix:@"https:"]) {
             enclosureLink = [NSURL URLWithString:enclosureLink relativeToURL:url].absoluteString;