Detailed Instructions: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
Q: What's its use?, Context: However, even if UTC is used internally, the systems still require information on time zones to correctly calculate local time where it is needed. Many systems in use today base their date/time calculations from data derived from the IANA time zone database also known as zoneinfo.
A:
correctly calculate local time