Category hub

Date & time calculators

Date differences, time durations, age, schedules and calendar tools built for quick answers and clear edge-case handling.

What 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

Date Calculator

Add or subtract dates and calculate differences in calendar days with clear date handling.

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Time Duration Calculator

Calculate differences between times and add or subtract hours, minutes and seconds.

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Age Calculator

Calculate age in years, months and days plus next birthday details.

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Arrival Time Calculator

Estimate arrival hour from start hour and duration hours.

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Time Zone Difference Calculator

Calculate time difference between two UTC offsets.

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Weeks Between Dates Calculator

Convert a day count into weeks.

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How 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

Recommended

Date Calculator

Add or subtract dates and calculate differences in calendar days with clear date handling.

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Recommended

Time Duration Calculator

Calculate differences between times and add or subtract hours, minutes and seconds.

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Recommended

Age Calculator

Calculate age in years, months and days plus next birthday details.

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Recommended

Arrival Time Calculator

Estimate arrival hour from start hour and duration hours.

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Recommended

Time Zone Difference Calculator

Calculate time difference between two UTC offsets.

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Recommended

Weeks Between Dates Calculator

Convert a day count into weeks.

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Recommended

Days to Hours Calculator

Convert days to hours.

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Recommended

Hours to Minutes Calculator

Convert hours to minutes.

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Recommended

Minutes to Seconds Calculator

Convert minutes to seconds.

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Recommended

Time Zone Calculator

Convert an hour using UTC offsets.

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Recommended

Day Counter

Count days from weeks and extra days.

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Recommended

Day of the Week Calculator

Calculate day-of-week index with Zeller-style numeric inputs.

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Recommended

Hours Calculator

Convert days and hours into total hours.

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Recommended

Business Days & Public Holidays Calculator

Calculate business days between two dates by country, excluding weekends and Nager.Date public holidays with optional regional filtering.

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Recommended

Public Holiday Calendar Calculator

Show a public holiday calendar for a selected country and year using Nager.Date, with weekday, weekend and regional notes.

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Recommended

Long Weekend Finder

Find long weekends and bridge-day opportunities for a selected country and year using the Nager.Date LongWeekend endpoint.

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Recommended

Holiday Difference Between Countries Calculator

Compare public holidays between two countries in the same year, including country-only dates and same-date overlaps.

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Recommended

Next Public Holiday Calculator

Find the next public holiday for a selected country using Nager.Date, with days until, weekday and upcoming holidays.

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Recommended

Working 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.

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Recommended

Deadline Holiday Calculator

Calculate a due date after a number of business days while skipping weekends and Nager.Date public holidays.

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