Principle of no-work-no-pay (dies non)

Dies non is a part of the Latin phrase literally meaning "a day when courts do not sit or carry on business". Dies non juridicum is the full Latin phrase literally meaning "Day without judiciary.

The expression dies non (juridicus) was used for defining a day which is not a (court) day or a day on which no legal business is carried on. Literally, dies non (juridicus) is "a not juridical day". Dictionary.com estimates that the word might have originated in 1600–10.