Date Calculator
Add or subtract dates and calculate differences in calendar days with clear date handling.
Open calculatorWhat this category helps with
Date & time calculators help with questions where a number is useful but the assumptions matter. Start with the calculator closest to your question, then use the linked guide or formula page when units, rates, dates, local rules or source data could change the answer.
Best starting points
Time Duration Calculator
Calculate differences between times and add or subtract hours, minutes and seconds.
Open calculatorAge Calculator
Calculate age in years, months and days plus next birthday details.
Open calculatorArrival Time Calculator
Estimate arrival hour from start hour and duration hours.
Open calculatorTime Zone Difference Calculator
Calculate time difference between two UTC offsets.
Open calculatorWeeks Between Dates Calculator
Convert a day count into weeks.
Open calculatorHow to choose the right calculator
- Use a broad calculator first when you need a quick estimate.
- Use a more specific calculator when rates, units, dates, eligibility or fees change the answer.
- Read assumptions before comparing results across calculators or external sources.
- For current-data topics, confirm the data source and date before relying on the result.
Calculators
Date Calculator
Add or subtract dates and calculate differences in calendar days with clear date handling.
Open calculatorTime Duration Calculator
Calculate differences between times and add or subtract hours, minutes and seconds.
Open calculatorAge Calculator
Calculate age in years, months and days plus next birthday details.
Open calculatorArrival Time Calculator
Estimate arrival hour from start hour and duration hours.
Open calculatorTime Zone Difference Calculator
Calculate time difference between two UTC offsets.
Open calculatorWeeks Between Dates Calculator
Convert a day count into weeks.
Open calculatorDays to Hours Calculator
Convert days to hours.
Open calculatorHours to Minutes Calculator
Convert hours to minutes.
Open calculatorMinutes to Seconds Calculator
Convert minutes to seconds.
Open calculatorTime Zone Calculator
Convert an hour using UTC offsets.
Open calculatorDay Counter
Count days from weeks and extra days.
Open calculatorDay of the Week Calculator
Calculate day-of-week index with Zeller-style numeric inputs.
Open calculatorHours Calculator
Convert days and hours into total hours.
Open calculatorBusiness Days & Public Holidays Calculator
Calculate business days between two dates by country, excluding weekends and Nager.Date public holidays with optional regional filtering.
Open calculatorPublic Holiday Calendar Calculator
Show a public holiday calendar for a selected country and year using Nager.Date, with weekday, weekend and regional notes.
Open calculatorLong Weekend Finder
Find long weekends and bridge-day opportunities for a selected country and year using the Nager.Date LongWeekend endpoint.
Open calculatorHoliday Difference Between Countries Calculator
Compare public holidays between two countries in the same year, including country-only dates and same-date overlaps.
Open calculatorNext Public Holiday Calculator
Find the next public holiday for a selected country using Nager.Date, with days until, weekday and upcoming holidays.
Open calculatorWorking Days Until Date Calculator
Count working days from today or a selected start date to a target date, excluding weekends and Nager.Date public holidays.
Open calculatorDeadline Holiday Calculator
Calculate a due date after a number of business days while skipping weekends and Nager.Date public holidays.
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