firstday

Firstday is a term that denotes the initial day of a period, event, or sequence. In calendars, it designates the 1st day of a month or year; the first day of the week varies by region. It is commonly used in education and employment to refer to the start of a school term or a new job and is typically associated with onboarding, introductions, and initial activities. In research and clinical contexts, Day 1 is used as the baseline from which subsequent days are compared. In culture and language, the first day of a season or a festival marks beginnings and renewal, as in phrases such as the first day of spring. The term also appears in branding or product names related to onboarding or initiation, depending on context. The concept of a first day is universal, reflecting how people structure time into discrete phases and emphasize beginnings.