diff --git a/lib/file-operations.js b/lib/file-operations.js
index e8f5adcd..2b59d665 100644
--- a/lib/file-operations.js
+++ b/lib/file-operations.js
@@ -5,7 +5,7 @@ var util = require('util');
 var fs = require('graceful-fs');
 var path = require('path');
 var assign = require('object-assign');
-var isValidDate = require('vali-date');
+var date = require('value-or-function').date;
 var FlushWriteStream = require('flush-write-stream');
 
 var constants = require('./constants');
@@ -52,24 +52,19 @@ function getModeDiff(fsMode, vinylMode) {
 
 function getTimesDiff(fsStat, vinylStat) {
 
-  if (!isValidDate(vinylStat.mtime)) {
+  var mtime = date(vinylStat.mtime);
+  if (!mtime) {
     return;
   }
 
-  if (+vinylStat.mtime === +fsStat.mtime &&
-      +vinylStat.atime === +fsStat.atime) {
+  var atime = date(vinylStat.atime);
+  if (+mtime === +fsStat.mtime &&
+      +atime === +fsStat.atime) {
     return;
   }
 
-  var atime;
-  if (isValidDate(vinylStat.atime)) {
-    atime = vinylStat.atime;
-  } else {
-    atime = fsStat.atime;
-  }
-
-  if (!isValidDate(atime)) {
-    atime = undefined;
+  if (!atime) {
+    atime = date(fsStat.atime) || undefined;
   }
 
   var timesDiff = {
diff --git a/package.json b/package.json
index ad7a4723..4233a612 100644
--- a/package.json
+++ b/package.json
@@ -40,8 +40,7 @@
     "strip-bom-stream": "^1.0.0",
     "through2": "^2.0.0",
     "through2-filter": "^2.0.0",
-    "vali-date": "^1.0.0",
-    "value-or-function": "^1.2.0",
+    "value-or-function": "^2.0.0",
     "vinyl": "^2.0.0"
   },
   "devDependencies": {