Configuring your WordPress install to use a rewrite not showing index.php in the URL.

1. Add this below in IIS properties tab ISAPI_rewrite tab for the website.

# Helicon ISAPI_Rewrite configuration file
# Version 3.1.0.32

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

2. In the WordPress settings permalink you need to click radio button for custom structure and add this below.

/%year%/%monthnum%/%postname%/