City history
From its ancient origin as the Punic trading post Yksm to the medieval island settlement of Jazair Bani Mazghanna, Algiers evolved from local solar time to standardized railway time in 1911 and permanent UTC+01:00 in 1981.
Chapter one
Earliest documented name
"Seagull Island"
The earliest documented name for the site of Algiers is the Punic or Phoenician name Yksm, later Hellenized as Ikosion and Latinized as Icosium. While the modern Arabic name Al-Jazair refers to offshore islands connected to the mainland in the 16th century, earlier indigenous Amazigh names are not explicitly recorded in surviving ancient texts.
Seagull Island or Gull Island
Phoenician coastal trading settlement established along the Bay of Algiers.
City of Twenty (Greek folk etymology)
Roman colonial city built over the older Punic settlement in Mauretania Caesariensis.
Islands of the Sons of Mazghanna
Founded by Berber Emir Buluggin ibn Ziri, referencing the local tribe and four offshore islets.
The Islands
Shortened under Ottoman rule and transcribed into European languages as Alger and Algiers.
Chapter two
Under French administrative decrees, Algiers replaced local solar time with Paris Mean Time (UTC+00:09:21) to streamline colonial telegraph and maritime communication between North Africa and France.
Algeria officially adopted Western European Time (UTC+00:00) based on Greenwich Mean Time, establishing a unified standard across its railway network and replacing Paris Mean Time.
Algiers implemented seasonal daylight saving time for the first time during World War I, advancing clocks by one hour to UTC+01:00 to conserve energy and coordinate with Allied wartime transport.
During World War II, administrative changes shifted Algeria's primary standard offset to Central European Time (UTC+01:00), reflecting wartime operational adjustments across Mediterranean ports.
Algeria permanently abolished seasonal daylight saving time adjustments on May 1, 1981, fixing Algiers to year-round UTC+01:00 Central European Time for simple administrative and economic continuity.
Chapter three
The Bouzareah Observatory was constructed on a ridge high above Algiers, becoming Algeria's premier scientific institution for stellar observation, precise local timekeeping, and international sky-mapping programs.
Construction was completed on the central post office, La Grande Poste d'Alger, whose prominent neo-Moorish clock tower served as a major public civic timekeeper in downtown Algiers.
The Algiers Metro began operations on November 1, 2011, providing the capital with an electronically synchronized rapid transit network that transformed urban transit scheduling.
Algeria officially designated Yennayer, the Amazigh agricultural New Year celebrated on January 12 under the traditional North African Berber calendar, as a national public holiday.