Digitalization is a technological and computer evolution. It breaks down barriers and boost exchanges: distance, information, collaboration, time periods… In the digital world, time occupies a small but central place: mails, trade, payment, data analysis… In the age of digital technology, of regulatory changes, of electronic signatures, of industry 4.0, of the Internet of Things, and with the importance of cybersecurity, time has become fundamental. The digitalization of exchanges and the search for automation place Time at the heart of the security and exploitation of companies’ data. Increased exchanges raise new challenges in the field of traceability and timestamping. Hence the growing attention paid to the use of the legal time of a country.