English to French Tech/Engineering Patents A before/after specific weekday determination device

contexte "the beginning and end conditions for daylight saving time are typically defined as a specific weekday, such as the n-th specific weekday (where n is an integer or 1 or more) from the beginning or end of a specific month, such as the "second Sunday in March, 0:00h" or the "last Sunday in March, 0:00h," and the dates on which daylight saving time starts and ends change from year to year. Therefore, in order to determine if daylight saving time is currently in effect, it is necessary to determine the first Sunday of the month and determine the date of, for example, the second Sunday."