WordPress at a glance
function is not described

the_modified_time() WP 2.0.0

Display the time at which the post was last modified.

Hooks from the function
Return

Null. Nothing.

Usage

the_modified_time( $format );
$format(string)
Either 'G', 'U', or PHP date format defaults to the value specified in the time_format option.
Default: ''

Changelog

Since 2.0.0 Introduced.

Code of the_modified_time() WP 5.5.1

<?php
function the_modified_time( $format = '' ) {
	/**
	 * Filters the localized time a post was last modified, for display.
	 *
	 * @since 2.0.0
	 *
	 * @param string $get_the_modified_time The formatted time.
	 * @param string $format                The time format. Accepts 'G', 'U',
	 *                                      or PHP date format. Defaults to value
	 *                                      specified in 'time_format' option.
	 */
	echo apply_filters( 'the_modified_time', get_the_modified_time( $format ), $format );
}