[1] Sierra Leone has never observed daylight saving time.
[2] Sierra Leone adopted its current time zone in 1939,[3] switching from UTC−01:00.
[4] In the IANA time zone database, Sierra Leone is given one zone in the file zone.tab – Africa/Freetown.
Data for Sierra Leone directly from zone.tab of the IANA time zone database; columns marked with * are the columns from zone.tab itself:[5]
You can help Wikipedia by expanding it.This standards- or measurement-related article is a stub.