refactor(locale): restore options for changing date format (#716)

_data/locales/en.yml

@@ -73,6 +73,16 @@ post:
   # pinned prompt of posts list on homepage
   pin_prompt: Pinned
 
+# Date time format.
+# See: <http://strftime.net/>, <https://day.js.org/docs/en/display/format>
+df:
+  post:
+    strftime: '%b %e, %Y'
+    dayjs: 'll'
+  archives:
+    strftime: '%b'
+    dayjs: 'MMM'
+
 # categories page
 categories:
   category_measure:

_data/locales/ko-KR.yml

@@ -73,6 +73,13 @@ post:
   # pinned prompt of posts list on homepage
   pin_prompt: 핀
 
+# 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: 카테고리

_data/locales/zh-CN.yml

@@ -72,6 +72,13 @@ post:
   # pinned prompt of posts list on homepage
   pin_prompt: 顶置
 
+# 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: 个分类

_includes/datetime.html

@@ -4,14 +4,8 @@
 -->
 
 {% assign wrap_elem = include.wrap | default: 'em' %}
-
-{% if site.prefer_datetime_locale == 'en' or lang == 'en' %}
-  {% assign df_strftime = '%b %e, %Y' %}
-  {% assign df_dayjs = 'll' %}
-{% else %}
-  {% assign df_strftime = '%F' %}
-  {% assign df_dayjs = 'YYYY-MM-DD' %}
-{% endif %}
+{% assign df_strftime = site.data.locales[lang].df.post.strftime | default: '%d/%m/%Y' %}
+{% assign df_dayjs = site.data.locales[lang].df.post.dayjs | default: 'DD/MM/YYYY' %}
 
 <{{ wrap_elem }} class="{% if include.class %}{{ include.class }}{% endif %}"
     data-ts="{{ include.date | date: '%s' }}"

_layouts/archives.html

@@ -5,13 +5,8 @@ layout: page
 
 {% include lang.html %}
 
-{% if site.prefer_datetime_locale == 'en' or lang == 'en' %}
-  {% assign df_strftime_m = '%b' %}
-  {% assign df_dayjs_m = 'MMM' %}
-{% else %}
-  {% assign df_strftime_m = '/ %m' %}
-  {% assign df_dayjs_m = '/ MM' %}
-{% endif %}
+{% assign df_strftime_m = site.data.locales[lang].df.archives.strftime | default: '/ %m' %}
+{% assign df_dayjs_m = site.data.locales[lang].df.archives.dayjs | default: '/ MM' %}
 
 <div id="archives" class="pl-xl-3">