Answer the following question: I know that the answer to the question "What is used?" is in "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.". Can you tell me what it is?
Answer:
the IANA time zone database also known as zoneinfo