Given a date in the timezone of the site, returns that date in UTC.

Get the most recent time that a post on the site was modified.

Returns a list of previously defined keys.

Retrieve post meta fields, based on post ID.

Retrieve meta field names for a post.

Retrieve values for a custom post field.

Retrieves an array of the latest posts, or posts matching the given criteria.

Returns meta data for the given post ID.

Checks if the current post is within any of the given categories.

Lists authors.