refactor: upgraded code to es6 standard

README.md

@@ -56,7 +56,7 @@ uuidv4(); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
 
 ```javascript
 import { v1 as uuidv1 } from 'uuid';
-uuidv1(); // ⇨ '29aedd50-8a1a-11ea-8bad-9b1deb4d3b7d'
+uuidv1(); // ⇨ '2c5ea4c0-4067-11e9-8bad-9b1deb4d3b7d'
 ```
 
 ### Create Version 3 or Version 5 (Namespace) UUIDs
@@ -202,16 +202,16 @@ Example: In-place generation of two binary IDs
 const arr = new Array();
 uuidv1(null, arr, 0); // ⇨ 
   // [
-  //    41, 176,  99, 240, 138, 26,
-  //    17, 234, 146,  52, 155, 29,
+  //    44,  94, 164, 192,  64, 103,
+  //    17, 233, 146,  52, 155,  29,
   //   235,  77,  59, 125
   // ]
 uuidv1(null, arr, 16); // ⇨ 
   // [
-  //    41, 176,  99, 240, 138, 26, 17, 234,
-  //   146,  52, 155,  29, 235, 77, 59, 125,
-  //    41, 176,  99, 241, 138, 26, 17, 234,
-  //   146,  52, 155,  29, 235, 77, 59, 125
+  //    44, 94, 164, 192,  64, 103, 17, 233,
+  //   146, 52, 155,  29, 235,  77, 59, 125,
+  //    44, 94, 164, 193,  64, 103, 17, 233,
+  //   146, 52, 155,  29, 235,  77, 59, 125
   // ]
 ```
 

src/v1.js

@@ -48,7 +48,7 @@ function v1(options, buf, offset) {
   // (1582-10-15 00:00).  JSNumbers aren't precise enough for this, so
   // time is handled internally as 'msecs' (integer milliseconds) and 'nsecs'
   // (100-nanoseconds offset from msecs) since unix epoch, 1970-01-01 00:00.
-  let msecs = options.msecs !== undefined ? options.msecs : Date.now();
+  let msecs = options.msecs !== undefined ? options.msecs : new Date().getTime();
 
   // Per 4.2.1.2, use count of uuid's generated during the current clock
   // cycle to simulate higher resolution clock