Create a UNIX timestamp based on two meta fields

Written by Bill EricksonPublished on December 10, 2011Updated on December 5, 2018

	<?php

	/**
	* Create a UNIX timestamp based on two meta fields
	* @author Bill Erickson
	*
	* @uses text_date_timestamp (for date, UNIX)
	* @uses text_time (for time, XX:XX AM/PM)
	* @link https://github.com/jaredatch/Custom-Metaboxes-and-Fields-for-WordPress
	*
	* @param int $post_id
	*/
	function be_timestamp_meta( $post_id ) {

	// Limit to 'event' post type. You can put whatever limit you want here
	if( 'event' !== get_post_type( $post_id ) )
	return;

	$date = get_post_meta( $post_id, 'be_event_date', true );
	$time = get_post_meta( $post_id, 'be_event_time', true );
	if( !empty( $date ) && !empty( $time ) ) {
	$date = date( 'm/d/Y', $date );
	$timestamp = strtotime( $date . ' ' . $time );
	update_post_meta( $post_id, 'be_event_timestamp', $timestamp );
	}

	}
	add_action( 'save_post', 'be_timestamp_meta', 99 );

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Useful for sorting events by date AND time (ex: 8am event before 9am event)

Bill Erickson is the co-founder and lead developer at CultivateWP, a WordPress agency focusing on high performance sites for web publishers.

I build custom WordPress websites that look great and are easy to manage.