 
 <prompt> Wetin dem dey use? Based on di last question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: However, even if UTC dey use internally, di systems still need information on time zones to dey calculate local time where e dey needed. Many systems wey dey use today dey base their date/time calculations from data wey dem get from di IANA time zone database wey dem also sabi as zoneinfo. 