fs: reduce usage of require('util')

PR-URL: #26783
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>

lib/internal/fs/utils.js

@@ -12,10 +12,13 @@ const {
   },
   hideStackFrames
 } = require('internal/errors');
-const { isUint8Array, isArrayBufferView } = require('internal/util/types');
+const {
+  isUint8Array,
+  isArrayBufferView,
+  isDate
+} = require('internal/util/types');
 const { once } = require('internal/util');
 const pathModule = require('path');
-const util = require('util');
 const kType = Symbol('type');
 const kStats = Symbol('stats');
 
@@ -383,7 +386,7 @@ function toUnixTimestamp(time, name = 'time') {
     }
     return time;
   }
-  if (util.isDate(time)) {
+  if (isDate(time)) {
     // Convert to 123.456 UNIX timestamp
     return time.getTime() / 1000;
   }