This day commemorates the Mexican Revolution which started on November 20, 1910 when Francisco I. Madero planned an uprising against dictator Porfirio Díaz's 31-year-long iron rule. Article 74 of the Mexican labor law (Ley Federal del Trabajo) provides that the third Monday of November (regardless the date) will be an official holiday in Mexico. This was a modification of the law made in 2005, effective since 2006; before then, it was November 20 regardless of the day, and all schools gave extended holidays if the day was a Tuesday or Thursday. Although November 20 is the official day, the uprising started on different days in different parts of the country.