Is it possible to define the data type of a Custom Field?

I am adding a new “Custom Post Type” named “Seminar”. I am defining three custom fields

  1. Location
  2. StartTime
  3. EndTime

StartTime and EndTime are going to store dates (surprise, surprise). I am wondering if there’s any way to tell WordPress to treat these like dates so that I can sort by them and stuff.

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I am very new to WP, so forgive me if this is a dumb question.

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2 comments

  1. Hia.

    Basically no. But, you can order by meta_value in WP_Query, so you can sort. I am not sure what format you are storing the dates as, but it will need to be something that MySQL can order by, a simple Unix timestamp would be fine, you would do:

    $query = new WP_Query( 'post_type=seminar&meta_key=start_time&meta_value=' . time() .  '&meta_compare=>' );
    

    Would get all the seminars with a start date after “now”

  2. The custom field value is stored as is – and I think you can use Joe’s answer to get the posts, however to “sort” using start time you might need to use something like this:

    $posts = query_posts($query_string. '&orderby=meta_value&meta_key=start_time&order=DESC' ); 
    

    There is a plug-in called more fields, that I think will let you do this without writing code. You can add a new input box only to your custom post type, then select date under advanced options.