diff --git a/content/histudy/2023/11.md b/content/histudy/2023/11.md
index 719f222c..57b693b8 100644
--- a/content/histudy/2023/11.md
+++ b/content/histudy/2023/11.md
@@ -1,6 +1,6 @@
 ---
 title: 姫路IT系勉強会 2023.11
-date: None
+date: 2023-11-18
 categories:
   - 開催履歴
   - meeting-log
diff --git a/content/histudy/2023/12.md b/content/histudy/2023/12.md
index 35455ab9..b532b250 100644
--- a/content/histudy/2023/12.md
+++ b/content/histudy/2023/12.md
@@ -1,6 +1,6 @@
 ---
 title: 姫路IT系勉強会 2023.12
-date: None
+date: 2023-12-16
 categories:
   - 開催履歴
   - meeting-log