#399

backend/app/services/post_metadata_fetcher.rb

@@ -81,12 +81,22 @@ class PostMetadataFetcher
     day = match[3].to_i
     hour = match[4].to_i
     minute = match[5]&.to_i || 0
+    second = match[6]&.to_i || 0
+    fraction = match[7]
     offset = match[8]
+    nanoseconds = parse_nanoseconds(fraction)
     timestamp =
         if offset.present?
-          Time.new(year, month, day, hour, minute, 0, parse_offset(offset)).in_time_zone
+          Time.new(
+              year,
+              month,
+              day,
+              hour,
+              minute,
+              second + Rational(nanoseconds, 1_000_000_000),
+              parse_offset(offset)).in_time_zone
         else
-          Time.zone.local(year, month, day, hour, minute)
+          Time.zone.local(year, month, day, hour, minute, second).change(nsec: nanoseconds)
         end
 
     from = timestamp.change(sec: 0, nsec: 0)
@@ -94,6 +104,13 @@ class PostMetadataFetcher
     [from, before]
   end
 
+  def self.parse_nanoseconds value
+    return 0 if value.blank?
+
+    digits = value[0, 9].ljust(9, '0')
+    Integer(digits, 10)
+  end
+
   def self.parse_offset value
     return '+00:00' if value == 'Z'
 
@@ -109,6 +126,7 @@ class PostMetadataFetcher
   private_class_method :platform_tags,
                        :original_created_range,
                        :parse_timestamp_range,
+                       :parse_nanoseconds,
                        :parse_offset,
                        :serialise_time
 end