diff --git a/swad_changelog.h b/swad_changelog.h
index 2045a3d3..47215c99 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -553,7 +553,7 @@ enscript -2 --landscape --color --file-align=2 --highlight --line-numbers -o - *
 En OpenSWAD:
 ps2pdf source.ps destination.pdf
 */
-#define Log_PLATFORM_VERSION	"SWAD 20.36.17 (2021-02-27)"
+#define Log_PLATFORM_VERSION	"SWAD 20.36.18 (2021-02-27)"
 #define CSS_FILE		"swad20.33.9.css"
 #define JS_FILE			"swad20.6.2.js"
 /*
@@ -601,6 +601,7 @@ TODO: DNI de un estudiante sale err
 TODO: BUG: Cuando un tipo de grupo sólo tiene un grupo, inscribirse es voluntario, el estudiante sólo puede pertenecer a un grupo, y se inscribe en él, debería poder desapuntarse. Ahora no puede.
 TODO: Salvador Romero Cortés: @acanas opción para editar posts
 
+	Version 20.36.18: Feb 27, 2021  Function moved to module swad_timeline_database. (305334 lines)
 	Version 20.36.17: Feb 27, 2021  Query moved to module swad_timeline_database. (305328 lines)
 	Version 20.36.16: Feb 27, 2021  Query moved to module swad_timeline_database. (305317 lines)
 	Version 20.36.15: Feb 27, 2021  Functions moved to module swad_timeline_database. (305305 lines)
diff --git a/swad_timeline_database.c b/swad_timeline_database.c
index e3a15461..c284f4e5 100644
--- a/swad_timeline_database.c
+++ b/swad_timeline_database.c
@@ -589,3 +589,37 @@ static long TL_DB_GetMedCodFromPub (long PubCod,const char *DBTable)
 
    return MedCod;
   }
+
+/*****************************************************************************/
+/************* Get last/first publication code stored in session *************/
+/*****************************************************************************/
+// FieldName can be:
+// "LastPubCod"
+// "FirstPubCod"
+
+long TL_DB_GetPubCodFromSession (const char *FieldName,
+                                 const char SessionId[Cns_BYTES_SESSION_ID + 1])
+  {
+   MYSQL_RES *mysql_res;
+   MYSQL_ROW row;
+   long PubCod;
+
+   /***** Get last publication code from database *****/
+   if (DB_QuerySELECT (&mysql_res,"can not get publication code from session",
+		       "SELECT %s FROM sessions"
+		       " WHERE SessionId='%s'",
+		       FieldName,SessionId) == 1)
+     {
+      /***** Get last publication code *****/
+      row = mysql_fetch_row (mysql_res);
+      if (sscanf (row[0],"%ld",&PubCod) != 1)
+	 PubCod = 0;
+     }
+   else
+      PubCod = 0;
+
+   /***** Free structure that stores the query result *****/
+   DB_FreeMySQLResult (&mysql_res);
+
+   return PubCod;
+  }
diff --git a/swad_timeline_database.h b/swad_timeline_database.h
index 94507597..1e9b474a 100644
--- a/swad_timeline_database.h
+++ b/swad_timeline_database.h
@@ -90,4 +90,8 @@ void TL_DB_RemoveCommentFavs (long PubCod);
 void TL_DB_RemoveCommentContent (long PubCod);
 void TL_DB_RemoveCommentPub (long PubCod,long PublisherCod);
 
+/* Publications */
+long TL_DB_GetPubCodFromSession (const char *FieldName,
+                                 const char SessionId[Cns_BYTES_SESSION_ID + 1]);
+
 #endif
diff --git a/swad_timeline_publication.c b/swad_timeline_publication.c
index 8bf01fc0..2813a7aa 100644
--- a/swad_timeline_publication.c
+++ b/swad_timeline_publication.c
@@ -88,7 +88,6 @@ static void TL_Pub_CreateSubQueryRangeBottom (const struct TL_Pub_RangePubsToGet
 static void TL_Pub_CreateSubQueryRangeTop (const struct TL_Pub_RangePubsToGet *RangePubsToGet,
                                            struct TL_Pub_SubQueries *SubQueries);
 
-static long TL_Pub_GetPubCodFromSession (const char *FieldName);
 static void TL_Pub_UpdateFirstLastPubCodesIntoSession (const struct TL_Timeline *Timeline);
 
 static struct TL_Pub_Publication *TL_Pub_SelectTheMostRecentPub (const struct TL_Pub_SubQueries *SubQueries);
@@ -150,13 +149,13 @@ void TL_Pub_GetListPubsToShowInTimeline (struct TL_Timeline *Timeline)
 					// newer than LastPubCod
 	 /* This query is made via AJAX automatically from time to time */
          RangePubsToGet.Top    = 0;	// +Infinite
-	 RangePubsToGet.Bottom = TL_Pub_GetPubCodFromSession ("LastPubCod");
+	 RangePubsToGet.Bottom = TL_DB_GetPubCodFromSession ("LastPubCod",Gbl.Session.Id);
 	 break;
       case TL_GET_ONLY_OLD_PUBS:	// Get some limited publications
 					// older than FirstPubCod
 	 /* This query is made via AJAX
 	    when I click in link to get old publications */
-	 RangePubsToGet.Top    = TL_Pub_GetPubCodFromSession ("FirstPubCod");
+	 RangePubsToGet.Top    = TL_DB_GetPubCodFromSession ("FirstPubCod",Gbl.Session.Id);
          RangePubsToGet.Bottom = 0;	// -Infinite
 	 break;
       case TL_GET_RECENT_TIMELINE:	// Get some limited recent publications
@@ -363,38 +362,6 @@ static void TL_Pub_CreateSubQueryRangeTop (const struct TL_Pub_RangePubsToGet *R
       SubQueries->RangeTop[0] = '\0';
   }
 
-/*****************************************************************************/
-/************* Get last/first publication code stored in session *************/
-/*****************************************************************************/
-// FieldName can be:
-// "LastPubCod"
-// "FirstPubCod"
-
-static long TL_Pub_GetPubCodFromSession (const char *FieldName)
-  {
-   extern const char *Txt_The_session_has_expired;
-   MYSQL_RES *mysql_res;
-   MYSQL_ROW row;
-   long PubCod;
-
-   /***** Get last publication code from database *****/
-   if (DB_QuerySELECT (&mysql_res,"can not get publication code from session",
-		       "SELECT %s FROM sessions"
-		       " WHERE SessionId='%s'",
-		       FieldName,Gbl.Session.Id) != 1)
-      Lay_ShowErrorAndExit (Txt_The_session_has_expired);
-
-   /***** Get last publication code *****/
-   row = mysql_fetch_row (mysql_res);
-   if (sscanf (row[0],"%ld",&PubCod) != 1)
-      PubCod = 0;
-
-   /***** Free structure that stores the query result *****/
-   DB_FreeMySQLResult (&mysql_res);
-
-   return PubCod;
-  }
-
 /*****************************************************************************/
 /************* Update first (oldest) and last (more recent)    ***************/
 /************* publication codes into session for next refresh ***************/