To parse a date string with a timezone offset specified at the end (e.g., +01:00) using the Carbon PHP package, you can use the createFromFormat method with the appropriate format string. Here's an example:
``` 
use Carbon\Carbon;

$dateString = '2022-03-16 15:30:00+01:00';
$format = 'Y-m-d H:i:sP';

$carbonInstance = Carbon::createFromFormat($format, $dateString);
$timestamp = $carbonInstance->timestamp;

echo $timestamp; // Output: 1647497400
``` 
In this example, we first define a date string with the timezone offset included. We also define the format string, which should match the structure of the date string. In this case, the format string is 'Y-m-d H:i:sP', where 'P' represents the timezone offset in the format +HH:mm.

We then use the Carbon::createFromFormat() method to create a Carbon instance from the date string and the format string. Finally, we call the timestamp method on the Carbon instance to get the Unix timestamp, which we can store in a variable or use as needed.
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