Can we configure the lastmodified date in Web Collection?

Yes, you can specify from where the lastmodified date has to be fetched for indexing in Web collection in the settings of Web Collection.

There are three options

• Default
• Meta
• Custom Header

Default

From the response header of the webpage
By selecting this option the lastmodified date would be taken from the response header of the page. This is the default option.

Meta

From the meta field
By selecting this option the lastmodified date would be taken from meta tags on the webpage. The meta tag name can be lastmodified or last-modified

<meta name="lastmodified" content="Wed, 20 Jan 2018 04:30:15 GMT" />
or
<meta name="last-modified" content="Wed, 20 Jan 2018 04:30:15 GMT" />

 

Custom Header

From the custom header of webserver hosting the pages
By selecting this option the custom date set in webserver htaccess file will be taken as a lastmodified date. The date format of the custom last modified date value within your Apache Web server can be set as shown:

<IfModule mod_headers.c>
  Header set SearchBlox-Last-modified "Wed, 29 Feb 2020 15:33:18 GMT"
</IfModule>

If you plan to use the a custom name, you can update SearchBlox to use your custom name.

You can set the SearchBlox Last Modified header name to your custom name by editing the file <SEARCHBLOX_INSTALLATION_PATH>/webapps/ROOT/WEB-INF/searchblox.yml :

http.lastmodified.header: SearchBlox-Last-modified

Example:
http.lastmodified.header: Custom-Last-modified

To learn more on lastmodified date for Web Collection read: Using lastmodified date for HTTP Collection