grammar.numbers.dates
Dates: el 15 de marzo de 2026
Day + de + month + de + year, all cardinals, months lowercase: el quince de marzo. 'On Monday' = el lunes, no preposition.
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Explication
A date is built as day + de + month + de + year, all in cardinal numbers, with the month in lowercase: el quince de marzo de 2026, el tres de julio. The question is ¿qué fecha es hoy? or ¿a cuánto estamos?, answered hoy es (el) doce de junio.
The first of the month is the one place an ordinal may appear: el primero de mayo (dominant in Latin America) or el uno de mayo (common in Spain). Every other day is a plain cardinal: el dos, el treinta y uno.
There's no preposition for 'on' a date — the article does it: llegamos el viernes, el 3 de julio. Years are read as full numbers (dos mil veintiséis, mil novecientos noventa), and the written format is day/month everywhere in the Spanish-speaking world.
Exemples
The contract expires on September 30th.
Région: global
He was born on May 1st, 1990.
Région: global
The fair runs from October 10th to 15th.