API Request with timestamp, how to add timezone?

For the API Retrieve all orders:

GET https://api.squarespace.com/{api-version}/commerce/orders?modifiedAfter={a-datetime}&modifiedBefore={b-datetime}

How should I manage the timestamp? 
In the document, it say YYYY-MM-DDThh:mm:ss.sZ.

But what dose .sZ means?

Our facility is in timezone +1 (Stockholm). 
For example, is then 2022-05-25T12:00:00+1000 correct?  

The date format appears to be in Java SimpleDateFormat.

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But what dose .sZ means?

From the document it appears to mean period seconds time zone.