Ever needed to know exactly how old someone is down to the day, how many working days fall between two dates, or what date lands 90 days from now? Date & Age: Chrono Reckoner turns those fiddly calendar questions into instant answers. It's a fast, fully offline date math toolkit for planners, professionals, students, and anyone who wants precise results without hunting through a calendar. Date Math. Instantly.

What sets Chrono apart is its focused, no-nonsense workflow. A short setup quiz during onboarding lets you choose which tool opens first, so the app launches straight into what you use most. Each calculator uses a clear INPUT PARAMS to RESULT flow with a built-in date picker, instant validation, and a one-tap copy button. Everything runs on your device with a clean Material 3 interface.

KEY FEATURES

• Compute Age & Countdown - Enter a birth date and get a precise age breakdown, with validation that stops future dates from slipping in.

• Calculate Date Differences - Pick a From Date and To Date to see the exact span between them, perfect for deadlines, anniversaries, and project timelines.

• Add & Subtract Durations - Choose a base date, an operation, and a duration count in your chosen unit to jump forward or backward to any target date.

• Count Workdays - Measure business days between dates, with a toggle to Include Weekends when you want Saturdays and Sundays counted too.

• Weekday Finder - Instantly reveal the day of the week for any date you enter.

• Recent Calculations - Your results are saved to a history list so you can revisit past work instead of retyping it, with delete options to keep things tidy.

• Copy Result - Send any answer to your clipboard with a single tap for quick pasting into messages, notes, or documents.

• Custom Date Format - Select your preferred layout for typing date entries so input matches the way you naturally write dates.

• Theme Preference - Switch between Light Mode, Dark Mode, or System Default to suit your eyes and environment.

• Guided Setup Quiz - The onboarding quiz asks which date tool you want to see first, tailoring the home screen to your needs. You can retake it anytime.

• Reset Application State - Clear your workspace and show the onboarding guides again whenever you want a fresh start.

HOW IT WORKS

On first launch, complete the quick Chrono Setup quiz to pick your default tool and formatting.

Choose a calculator, then enter your dates using the Open Date Picker or type them in your preferred format.

Tap RUN CALCULATION to see the RESULT, and use Copy Result to grab the answer.

Head to Settings anytime to adjust the theme, date format, workday rules, or retake the setup quiz.

PERFECT FOR

• Professionals counting billable or business workdays between dates.

• Anyone tracking ages, birthdays, and milestone countdowns.

• Planners scheduling deadlines by adding or subtracting durations.

• Students and researchers needing exact spans between events.

PRIVACY

Chrono Reckoner works completely offline with no account and no network calls. Your dates and calculation history stay on your device, and there are no ads to get in the way. It's a private, self-contained tool you can trust with everyday planning.

Stop guessing at the calendar and let Chrono do the arithmetic. Download Date & Age: Chrono Reckoner and get precise date answers in seconds, every time.