diff --git a/_posts/2019-08-29-math-api.markdown b/_posts/2018-10-23-math-api.markdown
similarity index 97%
rename from _posts/2019-08-29-math-api.markdown
rename to _posts/2018-10-23-math-api.markdown
index 7a2c82c..0eeb064 100644
--- a/_posts/2019-08-29-math-api.markdown
+++ b/_posts/2018-10-23-math-api.markdown
@@ -1,6 +1,6 @@
 ---
 title: 'Math API: LaTeX Math as SVG image'
-date: 2019-08-29 03:19:00 +09:00
+date: 2018-10-23 03:19:00 +09:00
 ---
 
 I've always wanted to put LaTeX Math equations on a web page where MathJax is not allowed to run inside it.