diff --git a/share/timedef/data/ru_SU.CP866.src b/share/timedef/data/ru_SU.CP866.src
index 40c3d483cc1..74d9f957acd 100644
--- a/share/timedef/data/ru_SU.CP866.src
+++ b/share/timedef/data/ru_SU.CP866.src
@@ -76,3 +76,18 @@
 # date_fmt
 #
 %a %e %b %Y %X %Z
+#
+# Long month names in alternative form
+#
+ï­¢ àì
+䥢ࠫì
+¬ àâ
+ ¯à¥«ì
+¬ ©
+¨î­ì
+¨î«ì
+ ¢£ãáâ
+ᥭâï¡àì
+®ªâï¡àì
+­®ï¡àì
+¤¥ª ¡àì
diff --git a/share/timedef/data/ru_SU.KOI8-R.src b/share/timedef/data/ru_SU.KOI8-R.src
index d308d02b516..4b6d867cbaf 100644
--- a/share/timedef/data/ru_SU.KOI8-R.src
+++ b/share/timedef/data/ru_SU.KOI8-R.src
@@ -76,3 +76,18 @@
 # date_fmt
 #
 %a %e %b %Y %X %Z
+#
+# Long month names in alternative form
+#
+ÑÎ×ÁÒØ
+ÆÅ×ÒÁÌØ
+ÍÁÒÔ
+ÁÐÒÅÌØ
+ÍÁÊ
+ÉÀÎØ
+ÉÀÌØ
+Á×ÇÕÓÔ
+ÓÅÎÔÑÂÒØ
+ÏËÔÑÂÒØ
+ÎÏÑÂÒØ
+ÄÅËÁÂÒØ
diff --git a/share/timedef/ru_RU.CP866.src b/share/timedef/ru_RU.CP866.src
index 40c3d483cc1..74d9f957acd 100644
--- a/share/timedef/ru_RU.CP866.src
+++ b/share/timedef/ru_RU.CP866.src
@@ -76,3 +76,18 @@
 # date_fmt
 #
 %a %e %b %Y %X %Z
+#
+# Long month names in alternative form
+#
+ï­¢ àì
+䥢ࠫì
+¬ àâ
+ ¯à¥«ì
+¬ ©
+¨î­ì
+¨î«ì
+ ¢£ãáâ
+ᥭâï¡àì
+®ªâï¡àì
+­®ï¡àì
+¤¥ª ¡àì
diff --git a/share/timedef/ru_RU.KOI8-R.src b/share/timedef/ru_RU.KOI8-R.src
index d308d02b516..4b6d867cbaf 100644
--- a/share/timedef/ru_RU.KOI8-R.src
+++ b/share/timedef/ru_RU.KOI8-R.src
@@ -76,3 +76,18 @@
 # date_fmt
 #
 %a %e %b %Y %X %Z
+#
+# Long month names in alternative form
+#
+ÑÎ×ÁÒØ
+ÆÅ×ÒÁÌØ
+ÍÁÒÔ
+ÁÐÒÅÌØ
+ÍÁÊ
+ÉÀÎØ
+ÉÀÌØ
+Á×ÇÕÓÔ
+ÓÅÎÔÑÂÒØ
+ÏËÔÑÂÒØ
+ÎÏÑÂÒØ
+ÄÅËÁÂÒØ
diff --git a/share/timedef/ru_SU.CP866.src b/share/timedef/ru_SU.CP866.src
index 40c3d483cc1..74d9f957acd 100644
--- a/share/timedef/ru_SU.CP866.src
+++ b/share/timedef/ru_SU.CP866.src
@@ -76,3 +76,18 @@
 # date_fmt
 #
 %a %e %b %Y %X %Z
+#
+# Long month names in alternative form
+#
+ï­¢ àì
+䥢ࠫì
+¬ àâ
+ ¯à¥«ì
+¬ ©
+¨î­ì
+¨î«ì
+ ¢£ãáâ
+ᥭâï¡àì
+®ªâï¡àì
+­®ï¡àì
+¤¥ª ¡àì
diff --git a/share/timedef/ru_SU.KOI8-R.src b/share/timedef/ru_SU.KOI8-R.src
index d308d02b516..4b6d867cbaf 100644
--- a/share/timedef/ru_SU.KOI8-R.src
+++ b/share/timedef/ru_SU.KOI8-R.src
@@ -76,3 +76,18 @@
 # date_fmt
 #
 %a %e %b %Y %X %Z
+#
+# Long month names in alternative form
+#
+ÑÎ×ÁÒØ
+ÆÅ×ÒÁÌØ
+ÍÁÒÔ
+ÁÐÒÅÌØ
+ÍÁÊ
+ÉÀÎØ
+ÉÀÌØ
+Á×ÇÕÓÔ
+ÓÅÎÔÑÂÒØ
+ÏËÔÑÂÒØ
+ÎÏÑÂÒØ
+ÄÅËÁÂÒØ