diff --git a/share/timedef/ja_JP.SJIS.src b/share/timedef/ja_JP.SJIS.src
index 8a1de08bb95b..ca6702dc588c 100644
--- a/share/timedef/ja_JP.SJIS.src
+++ b/share/timedef/ja_JP.SJIS.src
@@ -5,18 +5,18 @@
 #
 # Short month names
 #
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
-10
-11
-12
+ 1ŒŽ
+ 2ŒŽ
+ 3ŒŽ
+ 4ŒŽ
+ 5ŒŽ
+ 6ŒŽ
+ 7ŒŽ
+ 8ŒŽ
+ 9ŒŽ
+10ŒŽ
+11ŒŽ
+12ŒŽ
 #
 # Long month names (as in a date)
 #
@@ -65,7 +65,7 @@
 #
 # just following tradition...
 # %a %b %e %H:%M:%S %Y
-%a %b/%e %T %Y
+%a %_m/%e %T %Y
 #
 # am
 #
diff --git a/share/timedef/ja_JP.UTF-8.src b/share/timedef/ja_JP.UTF-8.src
index 9ee39a5286fe..21d0eb50d199 100644
--- a/share/timedef/ja_JP.UTF-8.src
+++ b/share/timedef/ja_JP.UTF-8.src
@@ -4,18 +4,18 @@
 # WARNING: empty lines are essential too
 #
 # Short month names
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
-10
-11
-12
+ 1月
+ 2月
+ 3月
+ 4月
+ 5月
+ 6月
+ 7月
+ 8月
+ 9月
+10月
+11月
+12月
 #
 # Long month names (as in a date)
 #
@@ -64,7 +64,7 @@
 #
 # just following tradition...
 # %a %b %e %H:%M:%S %Y
-%a %b/%e %T %Y
+%a %_m/%e %T %Y
 #
 # am
 #
diff --git a/share/timedef/ja_JP.eucJP.src b/share/timedef/ja_JP.eucJP.src
index 299f1a7a32bf..155d227c4c58 100644
--- a/share/timedef/ja_JP.eucJP.src
+++ b/share/timedef/ja_JP.eucJP.src
@@ -4,18 +4,18 @@
 # WARNING: empty lines are essential too
 #
 # Short month names
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
-10
-11
-12
+ 1·î
+ 2·î
+ 3·î
+ 4·î
+ 5·î
+ 6·î
+ 7·î
+ 8·î
+ 9·î
+10·î
+11·î
+12·î
 #
 # Long month names (as in a date)
 #
@@ -64,7 +64,7 @@
 #
 # just following tradition...
 # %a %b %e %H:%M:%S %Y
-%a %b/%e %T %Y
+%a %_m/%e %T %Y
 #
 # am
 #