blog: use standard time formatting helper

Signed-off-by: oppiliappan <[e-mail]>

appview/pages/funcmap.go

···
 				{D: math.MaxInt64, Format: "a long while %s", DivBy: 1},
 			})
 		},
+		"shortTimeFmt": func(t time.Time) string {
+			return t.Format("Jan 2, 2006")
+		},
 		"longTimeFmt": func(t time.Time) string {
 			return t.Format("Jan 2, 2006, 3:04 PM MST")
 		},

blog/templates/index.html

···
       </div>
       <div class="flex flex-col flex-1 px-5 py-4">
         <div class="text-xs text-gray-400 dark:text-gray-500 mb-2">
-          {{ $date := .ParsedDate }}{{ $date.Format "Jan 2, 2006" }}
+          {{ $date := .ParsedDate }}{{ $date | shortTimeFmt}}
           {{ if .Meta.Draft }}<span class="text-red-500">[draft]</span>{{ end }}
         </div>
         <h2 class="font-bold text-gray-900 dark:text-white text-base leading-snug mb-1 group-hover:underline">{{ .Meta.Title }}</h2>
···
         </span>
       </div>
       <div class="text-sm text-gray-400 dark:text-gray-500 shrink-0">
-        {{ $date := .ParsedDate }}{{ $date.Format "Jan 02, 2006" }}
+          {{ $date := .ParsedDate }}{{ $date | shortTimeFmt }}
       </div>
     </a>
     {{ end }}

blog/templates/post.html

···
       {{ $authors := .Post.Meta.Authors }}
       <p class="mb-1 text-sm text-gray-600 dark:text-gray-400">
         {{ $date := .Post.ParsedDate }}
-        {{ $date.Format "02 Jan, 2006" }}
+        {{ $date | shortTimeFmt }}
       </p>
 
       <h1 class="mb-0 text-2xl font-bold dark:text-white">

blog/templates/text.html

···
           <p class="px-6 mb-0 text-sm text-gray-600 dark:text-gray-400">
             {{ $dateStr := index .Meta "date" }}
             {{ $date := parsedate $dateStr }}
-            {{ $date.Format "02 Jan, 2006" }}
+            {{ $date.Format | shortTimeFmt }}
 
             <span class="mx-2 select-none">&middot;</span>