fix issues

src/org/thoughtcrime/securesms/conversation/ConversationAdapter.java

@@ -426,7 +426,9 @@ public class ConversationAdapter <V extends View & BindableConversationItem>
   @Override
   public void onBindHeaderViewHolder(HeaderViewHolder viewHolder, int position) {
     MessageRecord messageRecord = getRecordForPositionOrThrow(position);
-    viewHolder.setText(DateUtils.getRelativeDate(getContext(), locale, messageRecord.getDateReceived()));
+    long timestamp = messageRecord.getDateReceived();
+    if (recipient.getAddress().isOpenGroup()) { timestamp = messageRecord.getTimestamp(); }
+    viewHolder.setText(DateUtils.getRelativeDate(getContext(), locale, timestamp));
   }
 
   public void onBindLastSeenViewHolder(HeaderViewHolder viewHolder, int position) {

src/org/thoughtcrime/securesms/database/MmsDatabase.java

@@ -844,7 +844,7 @@ public class MmsDatabase extends MessagingDatabase {
     // we use current time like a sortId of iOS as the receive time.
     // Since the messages has been sorted by server timestamp before they are processed,
     // the order here by actual receiving time should be correct.
-    long receiveTimestamp = System.currentTimeMillis();
+    long receiveTimestamp = serverTimestamp;
     if (serverTimestamp == 0) { receiveTimestamp = retrieved.getSentTimeMillis(); }
     contentValues.put(DATE_RECEIVED, receiveTimestamp); // Loki - This is important due to how we handle GIFs
     contentValues.put(PART_COUNT, retrieved.getAttachments().size());

src/org/thoughtcrime/securesms/database/SmsDatabase.java

@@ -629,7 +629,7 @@ public class SmsDatabase extends MessagingDatabase {
     // we use current time like a sortId of iOS as the receive time.
     // Since the messages has been sorted by server timestamp before they are processed,
     // the order here by actual receiving time should be correct.
-    long receiveTimestamp = System.currentTimeMillis();
+    long receiveTimestamp = serverTimestamp;
     if (serverTimestamp == 0) { receiveTimestamp = message.getSentTimestampMillis(); }
     values.put(DATE_RECEIVED, receiveTimestamp); // Loki - This is important due to how we handle GIFs
     values.put(DATE_SENT, message.getSentTimestampMillis());

src/org/thoughtcrime/securesms/database/model/MessageRecord.java

@@ -139,6 +139,9 @@ public abstract class MessageRecord extends DisplayRecord {
     if (isPush() && getDateSent() < getDateReceived()) {
       return getDateSent();
     }
+    if (getRecipient().getAddress().isOpenGroup()) {
+      return getDateSent();
+    }
     return getDateReceived();
   }