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Use this shelf when a date, duration, age, or elapsed-time answer needs to be clear without hand-counting a calendar.
Time & date shelf
Quick time and date calculators for real planning.
Count days, calculate exact age, and work out elapsed time without saving anything or building a spreadsheet.
Deadlines and trips
Age and duration
Browser-only math
Educational date and time estimates only — values stay in the browser and are not saved or sent.
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Time & DateDate Difference CalculatorCount days, weeks, approximate months, and approximate years between two dates.Time & DateAge CalculatorCalculate age in years, months, days, total days, and total weeks.Time & DateTime Duration CalculatorCalculate elapsed hours and minutes between start and end times, including overnight spans.
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How to use this shelf
Choose the right tool
Use date difference for two calendar dates, time duration for hours and minutes, and age when the question is birthdate-based.
Verify before acting
Check time zone, daylight saving time, inclusive counting, business days, holidays, payroll rules, and the official deadline source.
Suggested workflow: For deadlines, calculate the plain answer first, then rerun it using the official rule for inclusive days, business days, or local time.
Date Difference Calculator
Count days, weeks, approximate months, and approximate years between two dates.
Age Calculator
Calculate age in years, months, days, total days, and total weeks.
Time Duration Calculator
Calculate elapsed hours and minutes between start and end times, including overnight spans.