Date Calculators
Calculators for dates, durations, and calendar math — exact age, countdowns, sobriety time, and leap years.
Part of Date & Time.
Calculators
- Clean Time CalculatorCalculate the number of days, months, and years since a sobriety or clean date.
- Mare Gestation CalculatorEstimate a mare's foaling date window from the breeding date.
- Age CalculatorCalculate exact age in years and total days from a birth date.
- Audiobook Speed CalculatorCalculate how long an audiobook will take at a different playback speed and see how much listening time you can save.
- Days Until CalculatorCalculate the number of days until any future date.
- Half Birthday CalculatorCalculate your next and previous half birthday, your age on that date, and how many days remain.
- Leap Year CalculatorCheck whether any year is a leap year using the official Gregorian calendar rule.
Last updated 7/12/2026