In-depth articles exploring chronology math, ISO calendar standards, and business day algorithms.
Life Milestones & Age
A comprehensive guide for parents on how school districts compute age thresholds, cutoff dates like September 1, and developmental readiness.
Date & Calendar Math
Demystifying the international ISO-8601 standard. Discover why the ISO week-year can differ from the calendar year and how weeks are numbered globally.
Business & Workdays
Learn how to accurately compute working days, handle international weekend variations, and avoid contractual disputes over inclusive vs exclusive start dates.
Date & Calendar Math
Why are some century years like 2000 leap years while 1900 and 2100 are not? Explore the astronomical math and history behind the Gregorian calendar leap rule.
