Last Modified and Timezones in Website Search Engine

Last Modified and Timezones in Website Search Engine

The website search engine software will during its crawl extract last modified values from all pages in your website. Both HTTP headers and META tags are checked.
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Website Search Engine Last Modified Values

Our software product A1 Website Search Engine extracts these values in one of the following ways:
  1. Checks if the webserver responds with last-modified HTTP response header:

    HTML pages: The webserver will usually generate this header for you.

    PHP example: Extract last-modified from file:
    <?php header("Last-Modified: " . gmdate("D, d M Y H:i:s", filemtime($SCRIPT_FILENAME)) . " GMT"); ?>.

    ASP example: Set hard coded last-modified:
    <% Response.AddHeader "Last-modified","Mon, 01 Jan 2000 11:22:33 GMT" %>.

    ASP.Net functions you can check documentation on:
    Response.Cache.SetLastModified(DateTime date);
    Response.AddFileDependancy(string filename);
  2. If no relevant HTTP reponse header, the page is checked for last-modified HTML meta tag.

Understand Timezone and Timestamps

You can always view the last-modified values retrieved in page data.

last modified timestamp for URL

Note: The server timezone will often be placed and configured to be different from your timezone. The date and time the server returns in last-modified depends on the server computer clock. This again depends on how the server timezone and clock has been configured.
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As one of the lead developers, his hands have touched most of the code in the software from Microsys.

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A1 Website Search EngineAbout A1 Website Search Engine

By giving your offline or online website a capabale search engine, you can ensure more of your visitors stay on your site. Having a search box helps visitors find what they are searching for.
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