[1] São Tomé and Príncipe has never observed daylight saving time.
[2] Under Portuguese rule, São Tomé and Príncipe first observed the local mean time UTC+0:26:56 until 1884, when it adopted UTC-0:36:45.
[3] The country briefly adopted West Africa Time (WAT; UTC+01:00) on 1 January 2018,[4] but reverted back on 1 January the following year.
[5] In the IANA time zone database, São Tomé and Príncipe is given one zone in the file zone.tab – Africa/Sao Tome.
Data for São Tomé and Príncipe directly from zone.tab of the IANA time zone database; columns marked with * are the columns from zone.tab itself:[3]