Convert Weeks to Months

The Week (symbol: wk) is a unit of time. A unit of time equal to exactly 7 days = 604,800 seconds. The seven-day week has cultural and religious roots predating most other time units — appearing independently in: ancient Babylonian astronomy (named for the seven 'classical planets' visible to the naked eye — Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn — preserved in modern English Sunday/Monday/Saturday and Romance-language Mardi/Mercredi/etc.); Jewish religious tradition (Sabbath/Shabbat seventh-day rest per Torah Genesis 2:2 and Exodus 20:8-11); Roman planetary week formalized by Emperor Constantine in 321 CE; Islamic Hijri calendar (Friday Jumu'ah congregational prayer per Qur'an 62:9). ISO 8601 formalizes week-numbering (ISO weeks W01-W52/W53, starting Monday). Practical applications: pay periods (US bi-weekly 2-week cycle most common; UK monthly; ECMA-376 Office Open XML date formats include week-of-year); gestational age in obstetrics per ACOG + RCOG (full-term 37-42 weeks; preterm <37 weeks); software-development sprint cycles per Scrum framework (1-4 week sprints, 2-week most common); academic terms (quarter ~10 weeks, semester ~15-17 weeks per US Department of Education credit-hour definition). Not an SI unit and not officially accepted for use alongside SI, but the most widely recognized calendar unit on Earth.

Weeks are commonly used in scheduling, physics, project management, and scientific computing.

The Month (symbol: mo) is a unit of time. A unit of time based on lunar or calendar cycles, averaging approximately 30.4368 days = 2,629,746 seconds in the Gregorian calendar (= 365.2425 days/year ÷ 12 months). Calendar months in the Gregorian system vary from 28 days (February non-leap year) to 31 days (January, March, May, July, August, October, December) — the irregular pattern preserved from Roman calendar reforms by Julius Caesar (Julian calendar 46 BCE) and Pope Gregory XIII (Gregorian reform 1582 CE that we still use). The synodic month (lunar phase cycle Full Moon to Full Moon) is 29.5306 days per IAU; the sidereal month (Moon's orbital period relative to distant stars) is 27.3217 days. Any numeric 'month' in financial-compounding or scientific calculations uses the Gregorian average (730 hours per month). Practical applications: monthly billing cycles for utilities, subscriptions, rent, insurance, loans (mortgages amortized in 360-month or 180-month schedules); gestational age in pediatrics per WHO + CDC growth charts (typical infant weight gain milestones 0-12 months); project scheduling per PMI PMBOK (typical project phases 1-6 months); seasonal analysis in economics (NBER business-cycle dating in months); climate-science monthly anomaly time series (NOAA GHCN, NASA GISTEMP, HadCRUT5).

Months are commonly used in scheduling, physics, project management, and scientific computing.