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Age Calculator
Calculate exact calendar age, elapsed totals, and the next birthday.
Open calculatorDate and Time Calculators
Calculate ages, date differences, workdays, durations, calendar details, eligibility dates, and world times.
Calendar dates, durations and world time
20 calculators
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Age and Eligibility
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Birthday Calculator
Find the next and previous birthday, days remaining, and milestone ages.
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Retirement Date Calculator
Estimate a retirement date from date of birth, editable age, and retirement rule.
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School Admission Age Calculator
Check a child’s exact age against user-entered admission cutoff rules.
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Exam Age Eligibility Calculator
Compare age on an official cutoff date with editable minimum, maximum, and relaxation rules.
Open calculatorDate Difference
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Date Difference Calculator
Measure signed or absolute calendar difference in years, months, days, and elapsed totals.
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Days Between Dates Calculator
Count calendar days, weeks, weekdays, and weekends with explicit inclusion rules.
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Months Between Dates Calculator
Calculate completed calendar months, years and months, remaining days, or fractional months.
Open calculatorDate Arithmetic
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Add or Subtract Days Calculator
Move a date by days, weeks, months, or years with optional weekend skipping.
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Business Days Calculator
Add or subtract business days using custom weekends and manually entered holidays.
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Date Calculator
Quickly compare dates, add or subtract date units, or find a weekday.
Open calculatorWork and Duration
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Working Days Calculator
Count working days using selectable weekends and manually entered holidays.
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Time Duration Calculator
Find elapsed time between clocks or dated times, including overnight spans and breaks.
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Hours Calculator
Add or subtract durations, convert decimal hours, or total multiple work shifts.
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Minutes to Hours Calculator
Convert minutes, decimal hours, or hours-and-minutes formats exactly.
Open calculatorCalendar Tools
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Day of the Week Calculator
Find a date’s weekday, day of year, ISO week, and neighboring weekly occurrences.
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Week Number Calculator
Find ISO, Monday-first, or Sunday-first week numbers and week boundaries.
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Leap Year Calculator
Check, find, or list Gregorian leap years using the century rule.
Open calculatorTime Tools
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Countdown Calculator
Show a live days-hours-minutes-seconds countdown to a local or UTC target.
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Time Zone Converter
Convert an entered wall-clock time between browser-supported IANA time zones.
Open calculatorAbout date and time calculators
Use calendar-safe tools for exact age, date differences, workday planning, time durations, eligibility cutoffs, week numbers, countdowns, and IANA timezone conversion. Date-only calculations avoid silent timezone shifts.