Added the legacy group 'joined_at' value

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

@@ -564,7 +564,7 @@ open class Storage(context: Context, helper: SQLCipherOpenHelper, private val co
                 val admins = group.members.filter { it.value /*admin = true*/ }.keys.map { Address.fromSerialized(it) }
                 val groupId = GroupUtil.doubleEncodeGroupID(group.sessionId)
                 val title = group.name
-                val formationTimestamp = SnodeAPI.nowWithOffset // TODO: formation timestamp for legacy ? current time?
+                val formationTimestamp = group.joinedAt
                 createGroup(groupId, title, members, null, null, admins, formationTimestamp)
                 setProfileSharing(Address.fromSerialized(groupId), true)
                 // Add the group to the user's set of public keys to poll for
@@ -835,7 +835,8 @@ open class Storage(context: Context, helper: SQLCipherOpenHelper, private val co
             priority = ConfigBase.PRIORITY_VISIBLE,
             encPubKey = encryptionKeyPair.publicKey.serialize(),
             encSecKey = encryptionKeyPair.privateKey.serialize(),
-            disappearingTimer = 0L
+            disappearingTimer = 0L,
+            joinedAt = formationTimestamp
         )
         // shouldn't exist, don't use getOrConstruct + copy
         userGroups.set(groupInfo)

app/src/main/java/org/thoughtcrime/securesms/util/ConfigurationMessageUtilities.kt

@@ -256,7 +256,8 @@ object ConfigurationMessageUtilities {
                 priority = if (isPinned) ConfigBase.PRIORITY_PINNED else ConfigBase.PRIORITY_VISIBLE,
                 encPubKey = encryptionKeyPair.publicKey.serialize(),
                 encSecKey = encryptionKeyPair.privateKey.serialize(),
-                disappearingTimer = recipient.expireMessages.toLong()
+                disappearingTimer = recipient.expireMessages.toLong(),
+                joinedAt = group.formationTimestamp
             )
         }
         (allOpenGroups + allLgc).forEach { groupInfo ->