patch: Converting miliseconds to Second as Unix timestamp is calculat…

…ed on seconds

_posts/en/2016-02-26-extract-unix-timestamp-easily.md

@@ -14,31 +14,38 @@ categories:
 We frequently need to calculate with unix timestamp. There are several ways to grab the timestamp. For current unix timestamp easiest and fastest way is
 
 ```js
-const timestamp = Date.now();
+const dateTime = Date.now();
+const timestamp = ~~(dateTime / 1000);
 ```
 or
 
 ```js
-const timestamp = new Date().getTime();
+const dateTime = new Date().getTime();
+const timestamp = ~~(dateTime / 1000);
 ```
 
 To get unix timestamp of a specific date pass `yyyy-mm-dd` as a parameter of `Date` constructor. For example
 
 ```js
-const timestamp = new Date('2012-06-08').getTime()
+const dateTime = new Date('2012-06-08').getTime();
+const timestamp = ~~(dateTime / 1000);
 ```
 You can just add a `+` sign also when declaring a `Date` object like below
 
 ```js
-const timestamp = +new Date()
+const dateTime = +new Date();
+const timestamp = ~~(dateTime / 1000);
 ```
 or for specific date
 
 ```js
-const timestamp = +new Date('2012-06-08')
+const dateTime = +new Date('2012-06-08');
+const timestamp = ~~(dateTime / 1000);
 ```
 Under the hood the runtime calls `valueOf` method of the `Date` object. Then the unary `+` operator calls `toNumber()` with that returned value. For detailed explanation please check the following links
 
 * [Date.prototype.valueOf](http://es5.github.io/#x15.9.5.8)
 * [Unary + operator](http://es5.github.io/#x11.4.6)
-* [toNumber()](http://es5.github.io/#x9.3)
+* [toNumber()](http://es5.github.io/#x9.3)
+* [Date Javascript MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date)
+* [Date.parse()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse)