It isn't pertinent.

That's not pertinent.

What time do you land in Perth?

Technically, you're right. However, you must also consider the unusual circumstances that pertain here.

That observation pertains to you, too.

A reward has been offered for information pertaining to the incident.

An American from Chicago can speak with an Australian accent after he visited Perth in Australia.

This discussion does not pertain to you.

I'm in Perth.

Computer technology is indispensable to access many pertinent items of data.