City history
Founded as the 9th-century fortress of Mayrit, Madrid calculated local solar time before adopting Greenwich Mean Time in 1901 and shifting to Central European Time in 1940.
Chapter one
Earliest documented name
"Place of abundant water courses"
First documented around 865 when Emir Muhammad I constructed a fortified citadel along the Manzanares River. Etymology is debated between Andalusi Arabic mayra, meaning water channel, and the earlier Mozarabic or Latin term Matrice.
Place of water channels
Established as a frontier citadel in al-Andalus under Emir Muhammad I of Cordoba to defend the northern approaches to Toledo.
Castilian phonetic adaptation of Mayrit
Recorded in medieval Castilian documents after King Alfonso VI of Leon and Castile captured the citadel in the late 11th century.
Modern Spanish city name
Evolved into the standard name of the city, which became the permanent royal capital of the Spanish Empire under King Philip II in 1561.
Chapter two
Spain issued a royal decree adopting Greenwich Mean Time (UTC+0) as the national standard time starting January 1, 1901, replacing Madrid Local Mean Time.
Spain introduced daylight saving time for the first time on April 15, 1918, during World War I, advancing clocks by one hour to conserve energy.
In March 1940, General Francisco Franco shifted Spain's standard time zone permanently from GMT (UTC+0) to Central European Time (UTC+1), putting Madrid out of alignment with its geographical longitude.
In response to the 1973 international oil crisis, Spain reintroduced seasonal daylight saving time to optimize energy conservation across the country.
Spain aligned its summer time schedule with European Union regulations, standardizing daylight saving adjustments from the last Sunday of March to the last Sunday of October.
Chapter three
King Charles III commissioned the Royal Observatory of Madrid in Retiro Park, designed by Juan de Villanueva, which served as Spain's official timekeeping authority.
Queen Isabel II inaugurated the famous clock tower mechanism crafted by watchmaker José Rodríguez Losada at the Casa de Correos in Madrid's central square.
On January 1, 1901, Madrid phased out its local mean solar time (UTC-0:15) as Spain officially adopted Greenwich Mean Time for all railway and civic schedules.
King Alfonso XIII inaugurated the first underground transit line in Madrid, accelerating urban reliance on standardized station timekeeping.
Spanish national television began broadcasting the live midnight chimes from the Puerta del Sol clock, establishing a nationwide New Year tradition.