Questão jurídica principal
Whether the employment contract clause required notice only for the end of a month or allowed notice with a one-month period ending on any date.
Decisão extraída
The cantonal court could interpret the clause as meaning that, absent clear wording to the contrary, notice had to respect the legal termination date at month-end.
Fundamentação extraída
The Federal Court found no arbitrariness: the lower courts first sought the parties' actual intent and then, under the trust principle, reasonably treated the imprecise clause as not clearly departing from the statutory rule on termination dates.