added getTime and now method in tips

_posts/en/2016-02-15-extract-unix-timestamp-easily.md

@@ -11,12 +11,27 @@ categories:
     - en
 ---
 
-We frequently need to calculate with unix timestamp. I think this is the most easiest way to grab the unix timestamp in Javascript. You just need to add a `+` sign when declaring a `Date` object like below
+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();
+```
+or
+```js
+const timestamp = new Date().getTime();
+```
+
+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()
+```
+
+If you like magic, just add a `+` sign when declaring a `Date` object like below
 
 ```js
 const timestamp = +new Date()
 ```
-To get unix timestamp of a specific date pass `yyyy-mm-dd` as a parameter of `Date` constructor. For example
+or for specific date
+
 ```js
 const timestamp = +new Date('2012-06-08')
 ```