Business days for legal deadlines: the details
The rules change with the setting. In administrative procedure, Law 39/2015 excludes Saturdays, Sundays and public holidays, and the period starts running the day after notification. In court proceedings, the days of August and those between December 24 and January 6 are also non-business days, except for urgent matters. Deadlines set in months or years run from date to date.
On top of that come regional and local holidays, which depend on where the court or agency sits. That’s why a deadline calculation isn’t a matter of subtracting dates: it needs the right calendar, the rule of the procedure and a professional’s judgment for the cases the law leaves unclear.