Date & Time

26 calculators

Date & Time

Date calculations, age, time zones, and duration tools

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26 available

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Date Calculator

Add or subtract days, weeks, months from dates

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Age Calculator

Calculate exact age in years, months, days

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Hours Calculator

Calculate time duration between two times

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Business Days Calculator

Count business days and weekend days between two dates

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Unix Timestamp Converter

Convert Unix timestamps to dates and vice versa with real-time display

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Date Duration Calculator

Calculate the days, weeks, months, and years between two dates.

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All Date & Time calculators

Date Difference

Calculate time between two dates

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Age in Days Calculator

Find out exactly how many days, weeks, hours, and minutes you've been alive.

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Time Zone Converter

Convert time between different time zones

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Days in Month Calculator

Find out exactly how many days are in any month of any year, with leap years handled correctly.

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Day of the Week Calculator

Find what day of the week any date falls on — past, present or future — in your own language.

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Add or Subtract Time Calculator

Add or subtract hours, minutes and seconds from a start time, with midnight rollover and negative results handled properly.

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12 Hour to 24 Hour Time Converter

Convert between 12-hour AM/PM time and 24-hour military time in either direction, with midnight and noon handled correctly.

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Countdown Timer

Count down the days, hours, minutes and seconds to any date — birthdays, weddings, launches, exams or holidays.

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Holiday Date Calculator

Find the exact date of any holiday in any year, and see how many days are left until it — US, UK and India.

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180 Day Calculator

Find the date 180 calendar days before or after a date.

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30 Day Calculator

Find the date 30 calendar days before or after a date.

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30 Minute Calculator

Add or subtract exactly 30 minutes from a validated clock time.

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45 Day Calculator

Find the date 45 calendar days before or after a date.

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6 Month Calculator

Find the date six calendar months before or after a date.

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60 Day Calculator

Find the date 60 calendar days before or after a date.

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8 Hour Shift Calculator

Find an eight-hour shift end time after an optional break.

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90 Day Calculator

Find the date 90 calendar days before or after a date.

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Acceptance Rate Calculator

Calculate accepted applicants as a percentage of total applicants.

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Audiobook Speed Calculator

Calculate listening time when an audiobook is played at a different speed.

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Day of the Year Calculator

Find a date's ordinal day from 1 to 365 or 366 in the proleptic Gregorian calendar.

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Date & Time calculators — Frequently asked questions

Quick answers about the date & time tools on Mathify.

How do I calculate my exact age?

Open the Age Calculator and enter your birth date to see years, months, days, and more.

Can I find the number of days between two dates?

Yes. The Date Difference tool counts total days, weekdays, and business days between any two dates.

Does Mathify support time zone conversions?

Yes. Use the Time Zone tool to compare times across cities and regions.