What Your Birth Date Reveals
A single date unlocks a surprising amount of information. The day of the week you were born comes from calendar arithmetic (the same math behind perpetual calendars). Your zodiac sign follows the traditional Western date ranges used for centuries. And your days lived is a straight count of calendar days, leap years included.
Zodiac Date Ranges
The twelve signs each cover roughly a month: Aries (Mar 21–Apr 19), Taurus (Apr 20–May 20), Gemini (May 21–Jun 20), Cancer (Jun 21–Jul 22), Leo (Jul 23–Aug 22), Virgo (Aug 23–Sep 22), Libra (Sep 23–Oct 22), Scorpio (Oct 23–Nov 21), Sagittarius (Nov 22–Dec 21), Capricorn (Dec 22–Jan 19), Aquarius (Jan 20–Feb 18), Pisces (Feb 19–Mar 20).
Milestone Math
Round-number milestones are just division: 10,000 days is about 27.4 years, and a billion seconds is about 31.7 years. They make great excuses for a party — and a fun way to appreciate how the calendar compounds.
Curious how old you are in exact years, months, and days? Try our age calculator.