DateTimeHQ / Guides

Guides

Plain-language explainers on how dates, calendars and time work, with charts, checklists, quizzes and calculators you can try as you read. Each guide supports one of the tools on this site.

Time and clocks

• Military time explained: how the 24-hour clock works Four digits, no colon, no AM or PM. How to convert, read and say military time. Supports the military time converter · 7 min read

Age and birthdays

• Which generation am I? Birth year ranges from Gen Z to Boomers Birth years for every generation, why the sources disagree, and what a cusp year is. Supports the generation calculator · 7 min read

More guides are published every week or two. Suggest a topic through the contact page.