Fixed recommended year format string for blog plugin

Author: squidfunk

docs/schema/plugins/blog.json

@@ -56,16 +56,16 @@
               "oneOf": [
                 {
                   "enum": [
-                    "YYYY",
-                    "YYYY/MM",
-                    "YYYY/MM/dd"
+                    "yyyy",
+                    "yyyy/MM",
+                    "yyyy/MM/dd"
                   ]
                 },
                 {
                   "type": "string"
                 }
               ],
-              "default": "YYYY"
+              "default": "yyyy"
             },
             "post_url_format": {
               "title": "Format string for post URLs",
@@ -149,31 +149,31 @@
               "oneOf": [
                 {
                   "enum": [
-                    "YYYY",
-                    "MMMM YYYY"
+                    "yyyy",
+                    "MMMM yyyy"
                   ]
                 },
                 {
                   "type": "string"
                 }
               ],
-              "default": "YYYY"
+              "default": "yyyy"
             },
             "archive_url_date_format": {
               "title": "Format string for archive dates in URLs",
               "markdownDescription": "https://squidfunk.github.io/mkdocs-material/setup/setting-up-a-blog/#+blog.archive_url_date_format",
               "oneOf": [
                 {
                   "enum": [
-                    "YYYY",
-                    "YYYY/MM"
+                    "yyyy",
+                    "yyyy/MM"
                   ]
                 },
                 {
                   "type": "string"
                 }
               ],
-              "default": "YYYY"
+              "default": "yyyy"
             },
             "archive_url_format": {
               "title": "Format string for archive URLs",

docs/setup/setting-up-a-blog.md

@@ -173,7 +173,7 @@ The following configuration options are available for posts:
 
 [`post_url_date_format`](#+blog.post_url_date_format){ #+blog.post_url_date_format }
 
-:   :octicons-milestone-24: Default: `YYYY/MM/dd` – This option specifies the
+:   :octicons-milestone-24: Default: `yyyy/MM/dd` – This option specifies the
     date format that is used in the URL of the post. The format string must
     adhere to [Babel]'s [pattern syntax]. Some examples:
 
@@ -182,23 +182,23 @@ The following configuration options are available for posts:
         ``` yaml
         plugins:
           - blog:
-              post_url_date_format: YYYY/MM/dd
+              post_url_date_format: yyyy/MM/dd
         ```
 
     === ":material-link: blog/2022/01/:material-dots-horizontal:/"
 
         ``` yaml
         plugins:
           - blog:
-              post_url_date_format: YYYY/MM
+              post_url_date_format: yyyy/MM
         ```
 
     === ":material-link: blog/2022/:material-dots-horizontal:/"
 
         ``` yaml
         plugins:
           - blog:
-              post_url_date_format: YYYY
+              post_url_date_format: yyyy
         ```
 
     If you want to exclude the date altogether, e.g. when your blog features
@@ -368,7 +368,7 @@ The following configuration options are available for archive index generation:
 
 [`archive_date_format`](#+blog.archive_date_format){ #+blog.archive_date_format }
 
-:   :octicons-milestone-24: Default: `YYYY` – This option specifies the date
+:   :octicons-milestone-24: Default: `yyyy` – This option specifies the date
     format that is used when archive indexes are rendered. The format string
     must adhere to [Babel]'s [pattern syntax]. Popular settings are:
 
@@ -377,20 +377,20 @@ The following configuration options are available for archive index generation:
         ``` yaml
         plugins:
           - blog:
-              archive_date_format: YYYY
+              archive_date_format: yyyy
         ```
 
     === "January 2022"
 
         ``` yaml
         plugins:
           - blog:
-              archive_date_format: MMMM YYYY
+              archive_date_format: MMMM yyyy
         ```
 
 [`archive_url_date_format`](#+blog.archive_url_date_format){ #+blog.archive_url_date_format }
 
-:   :octicons-milestone-24: Default: `YYYY` – This option specifies the date
+:   :octicons-milestone-24: Default: `yyyy` – This option specifies the date
     format that is used in the archive index URL. The format string must adhere
     to [Babel]'s [pattern syntax]. Some examples:
 
@@ -399,15 +399,15 @@ The following configuration options are available for archive index generation:
         ``` yaml
         plugins:
           - blog:
-              archive_url_date_format: YYYY
+              archive_url_date_format: yyyy
         ```
 
     === ":material-link: blog/archive/2022/01/"
 
         ``` yaml
         plugins:
           - blog:
-              archive_url_date_format: YYYY/MM
+              archive_url_date_format: yyyy/MM
         ```
 
 [`archive_url_format`](#+blog.archive_url_format){ #+blog.archive_url_format }