Given the following passage  "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.",  answer the following question. Note that the answer is present within the text.  Question: What's used?
A:
date/time calculations from data derived from the IANA time zone database also known as zoneinfo