How to set time zone offset?

ahhh, I know this is a naive question. but different date library has different rule, I usually use `yyyy-MM-dd'T'HH:mm:ss+08` in other date libraries, but it doesn't work for this library . I'm a little confused.

i use a logging library named pino, It uses this library, and time zone is UTC+0, and I want to change it.
So i try to find answer in your document, and I found the following Setting, it seems to be what i want, but I don't know how to use it.

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o | GMT/UTC timezone offset, e.g. -0500 or +0230.

What should I do?