I am trying to loop through all the post to get the top most shared posts on social network. I want to use the date_query parameter in the WP_query to get the posts of last two days , last 5 days, last 7 days and last 9 days. How can i implement it through using the date_query in WP_Query
My WP_query is

<?php
 $args = array(
  'post_type' => 'post',
  'order'=>'DESC',
  'posts_per_page' => 1,
  'date_query' => array(
                     array(
        'after'     => '10 days ago',
        'inclusive' => true,
       ),
     ),
  'orderby'=>'meta_value',
  'meta_key'=>'esml_socialcount_TOTAL'
  );
 $the_query = new WP_Query($args);
 if($the_query->have_posts()) { 
 while ($the_query->have_posts()){$the_query->the_post();
?>

Here are two ideas for your date_query part:

1) After 2 days ago:

If you need posts published after current time, 2 days ago:

'date_query' => array(
     array(
         'after'     => '2 days ago',  // or '-2 days'
         'inclusive' => true,
     ),
 ),

then the corresponding SQL part is:

 post_date >= '2014-09-09 17:57:15'

if the current date-time is 2014-09-11 17:57:15.

2) After midnight 2 days ago :

If you need posts published after midnight, 2 days ago:

'date_query' => array(
     array(
         'after'     => 'midnight 2 days ago',
         'inclusive' => true,
     ),
 ),

then the corresponding SQL part is:

 post_date >= '2014-09-09 00:00:00'

if the current date-time is 2014-09-11 17:57:15.

You can than easily modify this to other day periods.