After a dispute between a well-known company and its workers on this issue, the corresponding ruling of the Supreme Court makes clear the criterion to be applied: companies must communicate changes in working hours at least 5 days in advance to their workforce. In cases where there is a collective agreement, this period can be extended, but in no case reduced.
This ruling reminds us that irregular distributions of working hours are lawful and legal, but there must be this advance notice of at least 5 days to communicate to the worker the exact day and time on which they must provide their services. Similarly, in this type of changing schedule, daily and weekly breaks must always be respected.
The Law also makes it clear that the maximum weekly hours in a working day are 40, and from there each organization can agree with the workers and their representatives how this working time will be distributed, which may be irregular, and in case they do not agree, the company can freely award up to 10% of each employee's day.
With Timenet you can perfectly comply with all these regulations, since apart from allowing a completely flexible and geolocated system for each person to record and register their working hours, it has an internal messaging system that allows easy communication between the company and its workers.