Calculate exact time differences between birthdays in years, months, and days.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Pick Date of Birth for Person 1 and Person 2 using the calendar picker.
Inspect exact age gap broken down into years, months, days, weeks, and hours.
Copy the formatted relationship timeline to your clipboard.
The calculator accounts for varying month lengths and leap years to provide exact year, month, and day offsets.
It is a popular guideline suggesting the minimum socially acceptable age for a dating partner is half of the older person's age plus seven years.
Zero-egress companion tools in the Date & Time suite
Convert times across world timezones and compute exact business days.
Convert between Unix timestamps and human-readable UTC/ISO dates.
Calculate exact intervals, working business days, and future date offsets.
Calculate calendar and custom fiscal year quarters starting in any month (e.g. Feb, July, Oct).
