is_day() WP 1.5.0

Determines whether a day archive page is shown (example.com/2009/08/05) — page with posts for a specific day. A conditional tag.

No Hooks.

Return

true/false.

Usage

if( is_day() ){
	// ...
}

Examples

#1 Display text only on day archive pages

if( is_day() ){
	echo "This page is a page for 2019/08/15 [and link to example.com/2009/08/15]";
}

#2 Use of is_date() and is_day() together in if/else statements

if( is_day() )
	echo 'This is a day archive page.';
elseif( is_date() )
	echo 'This is a date archive page, for any date.';
else
	echo 'This is not a date archive page';

So is_archive() should follow is_day(), otherwise is_day() condition will never occur.

Code of is day: wp-includes/query.php ^{WP 5.2.2}

<?php
function is_day() {
	global $wp_query;

	if ( ! isset( $wp_query ) ) {
		_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' );
		return false;
	}

	return $wp_query->is_day();
}

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