The phrase "dies non" is derived from Latin and translates to "day not." It is often used in legal and administrative settings to refer to a day when regular activities are not conducted.
For example, public holidays like Christmas or New Year's Day are considered "dies non" because businesses and government offices are typically closed, and no official transactions or legal proceedings take place. On such days, employees are entitled to a day off, and any deadlines or time limits for legal matters are usually extended to the next working day. "Dies non" essentially designates a non-working day in various contexts.