Senegal first adopted UTC−01:00 on 1 January 1912.[5]
IANA time zone database
In the IANA time zone database, Senegal is given one zone in the file zone.tab – Africa/Dakar. "SN" refers to the country's ISO 3166-1 alpha-2country code. Data for Senegal directly from zone.tab of the IANA time zone database; columns marked with * are the columns from zone.tab itself:[6]