BirthdayGuides & explainers
Practical, easy-to-follow articles about age calculation, calendars, and everything date-related.
How to Calculate Your Age Accurately (Without a Calculator App)
Learn the exact method for calculating age in years, months, and days by hand, including how leap years affect the math.
5 min readLeap Years Explained: Why We Add a Day Every Four Years
A quick, clear explanation of the leap year rule, why it exists, and which years are exceptions to the pattern.
4 min readZodiac Signs by Birth Month: A Complete Quick Reference
A simple, at-a-glance guide to all twelve Western zodiac signs and the date ranges that define them.
6 min readHow Many Days Until My Birthday? Here's the Fastest Way to Find Out
Skip the manual counting - here's the quickest, most accurate way to find exactly how many days remain until your next birthday.
3 min readAge Around the World: Why Your Age Can Differ by Two Years Depending on the Country
In South Korea you could be two years older than your passport says. Here's how age is counted around the world, what changed in 2023, and how to get the right number on any form.
6 min readHow Old Are You in Days? 7 Milestone Ages Worth Celebrating (10,000 Days, 1 Billion Seconds and More)
Years are only one way to measure a life. Discover the day, hour and second milestones that arrive at surprising moments, and how to find the exact date of yours.
5 min readThe Birthday Paradox: Why Just 23 People Are Enough for a Shared Birthday
In a room of 23 people, there is a better than 50% chance that two of them share a birthday. Here's why it feels impossible, how the math works, and how to test it yourself.
5 min readHow to Calculate Your Work Experience Correctly for a Resume, Visa or Job Application
Partial months, gaps between jobs, overlapping roles: here's how to count your total work experience accurately, with a worked example you can copy.
6 min readWedding Anniversary Gifts by Year: Traditional Themes From Paper to Diamond
What is the traditional theme for each anniversary? A year-by-year guide from paper to diamond, gift ideas that fit, and how to work out your next milestone date.
6 min read