integer overflow in interval.c:312:11

### Description

The following code:

```php
<?php
$datetime = new DateTime();
$datetime->setTimestamp(PHP_INT_MAX);
```

Resulted in this output:
```
/home/dan/php-src/ext/date/lib/interval.c:312:11: runtime error: signed integer overflow: 1 + 9223372036854775807 cannot be represented in type 'long long int'
```



### PHP Version

8.4.1

### Operating System

_No response_