WP_Media_List_Table::column_date( WP_Post $post )

Source

File: wp-admin/includes/class-wp-media-list-table.php

public function column_date( $post ) {
		if ( '0000-00-00 00:00:00' === $post->post_date ) {
			$h_time = __( 'Unpublished' );
		} else {
			$time      = get_post_timestamp( $post );
			$time_diff = time() - $time;

			if ( $time && $time_diff > 0 && $time_diff < DAY_IN_SECONDS ) {
				/* translators: %s: Human-readable time difference. */
				$h_time = sprintf( __( '%s ago' ), human_time_diff( $time ) );
			} else {
				$h_time = get_the_time( __( 'Y/m/d' ), $post );
			}
		}

		echo $h_time;
	}