You can also use meta_query to check if a custom field is between two dates.

The most important thing you have to keep in mind is that your date format should be like YYYY-MM-DD or YYYY/MM/DD or something like that (year goes first, then month, then day, then time if you need it too). Check how it is stored in database – if it is stored in another format, for example days go first, then filtering won’t work for you until you change dates presence in database.

array(
	'key' => 'sale_day',
	'value' => array( '2018-01-01', '2018-01-09' ),
	'compare' => 'BETWEEN'
)

If the date is stored in UNIX time, example: 1543391233, everything became super simple:

array(
	'key' => 'sale_day',
	'value' => array( strtotime('2018-01-01'), strtotime('2018-01-09') ),
	'type' => 'numeric',
	'compare' => 'BETWEEN'
)

Multiple meta queries – get posts by multiple pairs of keys and values

Now I will show you how to combine posts by several (two or more) custom field values. First of all let me introduce you relation parameter which can accept two vaues – OR or AND (default).

// the 'color' is 'white' AND the 'price' is more than 2000 and less than 4000
$rd_query = new WP_Query( array(
	'meta_query' => array(
		'relation' => 'AND', // both of below conditions must match
		array(
			'key' => 'show_on_homepage',
			'value' => 'on'
		),
		array(
			'relation' => 'OR', // only 'color' OR 'price' must match
			array(
				'key' => 'color',
				'value' => 'white'
			),
			array(
				'key' => 'price',
				'value' => array( 2000, 4000 ),
				'type' => 'numeric',
				'compare' => 'BETWEEN'
			)
		)
	)
) );

As you can see, in meta_query above we used multiple relation.

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