Push empty convos to bottom and hide thread date when unknown

app/src/main/java/org/thoughtcrime/securesms/database/Storage.kt

@@ -496,7 +496,7 @@ open class Storage(
             // create note to self thread if needed (?)
             val address = recipient.address
             val ourThread = getThreadId(address) ?: getOrCreateThreadIdFor(address).also {
-                setThreadDate(it, SnodeAPI.nowWithOffset - 14.days.inWholeMilliseconds)
+                setThreadDate(it, 0)
             }
             DatabaseComponent.get(context).threadDatabase().setHasSent(ourThread, true)
             setPinned(ourThread, userProfile.getNtsPriority() > 0)
@@ -1188,7 +1188,7 @@ open class Storage(
             } else {
                 (
                     getThreadId(address) ?: getOrCreateThreadIdFor(address).also {
-                        setThreadDate(it, SnodeAPI.nowWithOffset - 14.days.inWholeMilliseconds)
+                        setThreadDate(it, 0)
                     }
                 ).also { setPinned(it, contact.priority == PRIORITY_PINNED) }
             }

app/src/main/java/org/thoughtcrime/securesms/home/ConversationView.kt

@@ -92,7 +92,7 @@ class ConversationView : LinearLayout {
         val senderDisplayName = getUserDisplayName(thread.recipient)
                 ?: thread.recipient.address.toString()
         binding.conversationViewDisplayNameTextView.text = senderDisplayName
-        binding.timestampTextView.text = DateUtils.getDisplayFormattedTimeSpanString(context, Locale.getDefault(), thread.date)
+        binding.timestampTextView.text = thread.date.takeIf { it != 0L }?.let { DateUtils.getDisplayFormattedTimeSpanString(context, Locale.getDefault(), it) }
         val recipient = thread.recipient
         binding.muteIndicatorImageView.isVisible = recipient.isMuted || recipient.notifyType != NOTIFY_TYPE_ALL
         val drawableRes = if (recipient.isMuted || recipient.notifyType == NOTIFY_TYPE_NONE) {