Date & Time Calculators
Calculate your exact age, days between two dates, and duration between events with precise day, month, and year breakdowns.
Calculators in this category
- Age CalculatorExact age in years, months and days.
- Days Between Dates CalculatorCount days, weeks, and months between two dates.
- Chronological Age CalculatorRecords-style age between birth and reference date.
- Time Duration CalculatorElapsed time between two date-times.
- Hours CalculatorWork hours between start and end, minus breaks.
About date & time calculators
Date and time calculators answer questions that sound simple until you try to do them on paper. How old will I be in 2030? How many business days until the project deadline? Was my birthday on a Tuesday? Calendars have unequal months and leap years, so doing this by hand is fiddly even when the dates are only weeks apart.
The Age calculator returns your exact age in years, months, and days, plus totals in months, weeks, days, hours, minutes, and seconds, and the weekday you were born on. The Days Between Dates calculator counts the duration between two calendar dates, with optional business-days mode and add/subtract-days mode for planning.
Both tools handle leap years and end-of-month edge cases correctly by doing real calendar subtraction — not by assuming 30-day months or 365-day years.
Popular date & time tools
- Age Calculator — Exact age in years, months and days.
- Days Between Dates Calculator — Count days, weeks, and months between two dates.
- Chronological Age Calculator — Records-style age between birth and reference date.
- Time Duration Calculator — Elapsed time between two date-times.
- Hours Calculator — Work hours between start and end, minus breaks.
Frequently asked questions
›How is exact age calculated?
Subtract birth date from target date one unit at a time — day, then month, then year — borrowing from the previous unit when a value goes negative, just as you would on paper.
›Do these handle leap years?
Yes. The calculators use real calendar arithmetic, so February 29 birthdays and leap days inside an interval are counted correctly.
›Can I count only business days?
Yes. The Days Between Dates calculator includes a business-days mode that skips Saturdays and Sundays.
›What if my end date is earlier than my start date?
The calculator uses the absolute difference and notes that the dates were reversed, so you still get the correct duration.