From 4aa1c22b9412752ac210ee36f23b7872e9f13029 Mon Sep 17 00:00:00 2001
From: Damien Regad <dregad@mantisbt.org>
Date: Sun, 21 Feb 2021 17:01:57 +0100
Subject: [PATCH] Fix PHP warning when updating issue with date CF

On PHP 8, when updating an issue in a project where a date custom field
is linked, and the field's value is not set (empty string), Mantis
throws a Warning:

Uncaught TypeError: date(): Argument #2 ($timestamp) must be of type
?int, string given

This fixes the issue by setting the date to 0 if it is not numeric,
prior to calling print_date_selection_set().

Fixes #27928

(cherry picked from commit c09fb41bf8beae969013029ad0577ab11344e8b1)
---
 core/cfdefs/cfdef_standard.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/core/cfdefs/cfdef_standard.php b/core/cfdefs/cfdef_standard.php
index 039c1c86ca..2cc442052f 100644
--- a/core/cfdefs/cfdef_standard.php
+++ b/core/cfdefs/cfdef_standard.php
@@ -497,6 +497,9 @@ function cfdef_input_textarea( array $p_field_def, $p_custom_field_value, $p_req
  * @return void
  */
 function cfdef_input_date( $p_field_def, $p_custom_field_value, $p_required = '' ) {
+	if( !is_numeric( $p_custom_field_value ) ) {
+		$p_custom_field_value = 0;
+	}
 	print_date_selection_set( 'custom_field_' . $p_field_def['id'], config_get( 'short_date_format' ), $p_custom_field_value, false, true, 0, 0, 'input-sm', $p_required );
 }