update date format

Author: delynchoong

_data/locales/ca-ES.yml

@@ -71,6 +71,13 @@ post:
       title: Copiar enllaç
       succeed: Enllaç copiat!
 
+# Date time format.
+# See: <http://strftime.net/>, <https://day.js.org/docs/en/display/format>
+df:
+  post:
+    strftime: "%Y/%m/%d"
+    dayjs: "YYYY/MM/DD"
+
 # categories page
 categories:
   category_measure: categories