WordPress at a glance
function is not described

wp_resolve_post_date() WP 5.7.0

Uses wp_checkdate to return a valid Gregorian-calendar value for post_date. If post_date is not provided, this first checks post_date_gmt if provided, then falls back to use the current time.

For back-compat purposes in wp_insert_post, an empty post_date and an invalid post_date_gmt will continue to return '1970-01-01 00:00:00' rather than false.

No Hooks.

Return

String|false. A valid Gregorian-calendar date string, or false on failure.

Usage

wp_resolve_post_date( $post_date, $post_date_gmt );
$post_date(string)
The date in mysql format.
$post_date_gmt(string)
The GMT date in mysql format.

Changelog

Since 5.7.0 Introduced.

Code of wp_resolve_post_date() WP 5.7

<?php
function wp_resolve_post_date( $post_date = '', $post_date_gmt = '' ) {
	// If the date is empty, set the date to now.
	if ( empty( $post_date ) || '0000-00-00 00:00:00' === $post_date ) {
		if ( empty( $post_date_gmt ) || '0000-00-00 00:00:00' === $post_date_gmt ) {
			$post_date = current_time( 'mysql' );
		} else {
			$post_date = get_date_from_gmt( $post_date_gmt );
		}
	}

	// Validate the date.
	$month = substr( $post_date, 5, 2 );
	$day   = substr( $post_date, 8, 2 );
	$year  = substr( $post_date, 0, 4 );

	$valid_date = wp_checkdate( $month, $day, $year, $post_date );

	if ( ! $valid_date ) {
		return false;
	}
	return $post_date;
}