ISO8601d: Epoch strings are parsed without the same validation as other dates

src/ISO8601.cpp

@@ -239,9 +239,8 @@ bool ISO8601d::parse (
       parse_date_ext      (n)         ||
       parse_time_utc_ext  (n)         ||
       parse_time_off_ext  (n)         ||
-      parse_time_ext      (n)         ||
-      parse_named         (n)         ||
-      parse_epoch         (n))             // Time last, as it is the most permissive.
+      parse_time_ext      (n)         || // Time last, as it is the most permissive.
+      parse_named         (n))
   {
     // Check the values and determine time_t.
     if (validate ())
@@ -254,6 +253,13 @@ bool ISO8601d::parse (
     }
   }
 
+  // ::parse_epoch doesn't require ::validate and ::resolve.
+  else if (parse_epoch (n))
+  {
+    start = n.cursor ();
+    return true;
+  }
+
   return false;
 }