About TimeCal.net
TimeCal.net is a free collection of date and time calculators designed for everyday use. Whether you need to know how many days until an event, find a date 90 days from today, or calculate the exact duration between two dates, TimeCal gives you a fast, accurate answer — no sign-up, no ads, no friction.
Our Calculators
TimeCal currently offers three calculators:
- Future & Past Date Calculator — Add or subtract days, weeks, months, or years from any date. Useful for deadlines, expiry dates, countdowns, and historical research.
- Time Span Calculator — Find the exact duration between two dates in years, months, weeks, and days. Accepts "today" and "tomorrow" as input.
- Half-Birthday Calculator — Find the date exactly 183 days after any birthday, with full leap-year support.
How We Build Our Calculators
Every calculator on TimeCal is built with the following principles:
- Accuracy first. All calculations follow the Gregorian calendar, correctly handling leap years, variable month lengths, and edge cases.
- Server-side rendering. Results are computed on the server — no JavaScript required to get an answer.
- Shareable URLs. Every result has its own permanent URL so you can bookmark or share it directly.
- No account required. Open a calculator, get your answer, done.
Who Made This
TimeCal.net was created and is maintained by Adilson Fernandes, an engineer based in Recife, Brazil, with over a decade of experience building web-based calculation tools. The site is part of a broader portfolio of converter and calculator websites, including CoolConversion.com.
Accuracy & Sources
Date calculations follow the proleptic Gregorian calendar as defined by ISO 8601.
Leap year detection uses the standard rule: divisible by 4, except century years unless
also divisible by 400. All calculations are implemented in PHP using the built-in
DateTime and DateInterval classes.
References:
Contact
Questions, corrections, or suggestions? Use the contact form or send an email to the address on that page.
Last updated: March 2026