Signed integer overflow in ext/calendar/cal_unix.c:63

[YuanchengJiang]

Description

The following code:

<?php
jdtounix(-9223372036854775807);

Resulted in this output:

/php-src/ext/calendar/cal_unix.c:63:7: runtime error: signed integer overflow: -9223372036854775807 - 2440588 cannot be represented in type 'long'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /php-src/ext/calendar/cal_unix.c:63:7

### PHP Version

PHP 8.4.0-dev

### Operating System

ubuntu 22.04