can I get the company's timezone and user's timezone in SuiteScript?

Company Timezone is available via `N/config`; you can load the Company Information values. There is not necessarily a User in the Scheduled Script context.

If the user is calling an on-demand scheduled script that needs the user's timezone, could you have the calling script (UE, CS?) determine the user's timezone and pass it as a parameter to the scheduled script?

If no timezone is provided via parameter, default to the Company Timezone perhaps