week Unit Converter

Definition of week unit

A week is a standardized time interval of seven consecutive days, equal to 168 hours. In the SI-referenced day-based convention, it is not an SI base unit, but it is accepted for use with the International System of Units.

History of week unit

The seven-day week has ancient roots in the calendars of Mesopotamia, where lunar phases encouraged divisions into periods of roughly seven days. The Babylonians associated the days with celestial bodies, a practice later reflected in classical Greek and Roman traditions. Judaism formalized a recurring seven-day cycle through the Sabbath, while Christianity and Islam transmitted and adapted the pattern across wider regions. The Roman Emperor Constantine officially recognized Sunday as a weekly day of rest in 321 CE. The modern international calendar retains this uninterrupted seven-day cycle.

Applications of week unit

Weeks organize schedules in workplaces, schools, project plans, payroll, broadcasting, and transportation. People commonly describe appointments as occurring next week or measure durations in whole weeks. Many business systems use the ISO week date, which begins weeks on Monday and identifies them by year and number. Fitness programs, pregnancies, subscriptions, and weather forecasts also routinely use weeks.

Complete list of week unit conversion