#399

backend/app/services/post_metadata_fetcher.rb

@@ -1,8 +1,9 @@
 class PostMetadataFetcher
   TIMESTAMP_PATTERN =
-      /\A(\d{4})-(\d{2})-(\d{2})T(\d{2})/ \
-      /(?::(\d{2})(?::(\d{2})(?:\.(\d+))?)?)?/ \
-      /(Z|[+-]\d{2}:?\d{2})?\z/
+      Regexp.new(
+          '\A(\d{4})-(\d{2})-(\d{2})T(\d{2})' \
+          '(?::(\d{2})(?::(\d{2})(?:\.(\d+))?)?)?' \
+          '(Z|[+-]\d{2}:?\d{2})?\z')
 
   def self.fetch raw_url
     uri, = Preview::UrlSafety.validate(raw_url)
@@ -80,9 +81,14 @@ class PostMetadataFetcher
     minute = match[5]&.to_i || 0
     second = match[6]&.to_i || 0
     fraction = match[7]
-    offset = parse_offset(match[8])
-    from = Time.new(year, month, day, hour, minute, second + fractional_seconds(fraction), offset)
-              .in_time_zone
+    offset = match[8]
+    whole_second = second + fractional_seconds(fraction)
+    from =
+        if offset.present?
+          Time.new(year, month, day, hour, minute, whole_second, parse_offset(offset)).in_time_zone
+        else
+          Time.zone.local(year, month, day, hour, minute, whole_second)
+        end
     before =
         if fraction.present?
           from + (10**(-fraction.length))
@@ -97,7 +103,6 @@ class PostMetadataFetcher
   end
 
   def self.parse_offset value
-    return Time.zone.formatted_offset if value.blank?
     return '+00:00' if value == 'Z'
 
     value.match?(/\A[+-]\d{2}:\d{2}\z/) ? value : "#{ value[0, 3] }:#{ value[3, 2] }"