Date Calculators
Browse our comprehensive collection of date calculators for date differences, age, day of week, calendar generation, business days, countdowns, and more. Free online tools for scheduling, planning, and personal use.
Date Difference Calculator
Calculate the exact number of days, months, and years between two dates with detailed breakdown.
differenceDays Between Dates
Find the total number of days between two dates with calendar visualization.
differenceWeeks Between Dates
Calculate the number of weeks and days between two dates with week counting.
differenceMonths Between Dates
Calculate the number of months (calendar months) between two dates.
differenceYears Between Dates
Calculate the number of years (including leap years) between two dates.
differenceWeekdays Between Dates
Count the number of weekdays (Mon-Fri) and weekends between two dates.
differenceDay Counter (From Today)
Count days from today to a future or past date with daily progress tracking.
differenceDate Duration Calculator
Calculate duration between dates in days, hours, minutes, and seconds.
differenceAge Calculator
Calculate exact age in years, months, days, hours, minutes, and seconds from date of birth.
ageAge in Days Calculator
Calculate how many days old you are from your date of birth with day counting.
ageBirthday Countdown
Count down to your next birthday with days, hours, minutes, and seconds.
ageAge Difference Calculator
Calculate the age difference between two people or dates with comparison.
ageDate of Birth Finder
Find date of birth from age and current date with reverse calculation.
ageRetirement Date Calculator
Calculate retirement date based on birth date and retirement age.
ageZodiac Sign Calculator
Find your zodiac sign based on date of birth with personality traits.
ageChinese Zodiac Calculator
Determine your Chinese zodiac animal from your birth year with characteristics.
ageCalendar Month View
Display a full calendar for any month with holidays and week numbers.
calendarYearly Calendar Generator
Generate a complete yearly calendar for any year with monthly views.
calendarWeek Number Calculator
Find the ISO week number of the year for any date.
calendarDay of the Week Finder
Find the day of the week (Monday-Sunday) for any given date.
calendarLeap Year Checker
Check if a year is a leap year with explanation and historical context.
calendarQuarter & Fiscal Year
Determine the quarter and fiscal year for any given date.
calendarMonth Length Calculator
Find the number of days in any month of any year, accounting for leap years.
calendarCalendar Week Planner
Create a weekly planner with dates and days of the week for any week.
calendarBusiness Days Calculator
Calculate the number of business days between two dates, excluding weekends and holidays.
businessAdd Business Days to Date
Add a specific number of business days to a date, skipping weekends and holidays.
businessBusiness Days from Today
Find the date that is a certain number of business days from today.
businessWorking Days Counter
Count working days (Mon-Fri) in a given date range with holiday exclusions.
businessHoliday Impact on Business Days
Calculate how holidays affect business day calculations with custom holiday lists.
businessDeadline Calculator (Business Days)
Calculate project deadlines based on business day counts from start date.
businessBusiness Day of Month
Find the business day number of the month for any date (1st working day, etc.).
businessInvoice Due Date Calculator
Calculate invoice due date based on payment terms (Net 30, Net 60, etc.).
businessCountdown to Date
Count down the days, hours, minutes, and seconds to any future date.
countdownAdd Days to Date
Add a specific number of days to a date with step-by-step calculation.
countdownSubtract Days from Date
Subtract a specific number of days from a date with detailed steps.
countdownAdd Months to Date
Add a specific number of months to a date with calendar month logic.
countdownAdd Years to Date
Add a specific number of years to a date with leap year consideration.
countdownTime Since Date Calculator
Calculate the time elapsed since a past date in years, months, days, hours, and minutes.
countdownEvent Countdown Timer
Set a countdown for any event with progress bar and milestone tracking.
countdownDate & Time Difference
Calculate the exact difference between two dates including time (hours, minutes).
countdownDate Format Converter
Convert dates between different formats (YYYY-MM-DD, DD/MM/YYYY, MM/DD/YYYY, etc.).
conversionJulian Date Converter
Convert between Gregorian dates and Julian Day Number (JDN).
conversionUnix Timestamp to Date
Convert Unix timestamps to readable dates and vice versa.
conversionISO Week to Date
Find the date from ISO week number and year with week dates.
conversionOrdinal Date to Calendar
Convert ordinal date (day of year) to calendar date and vice versa.
conversionExcel Date Serial Converter
Convert Excel date serial numbers to standard dates and back.
conversionHijri to Gregorian Converter
Convert between Islamic (Hijri) dates and Gregorian calendar dates.
conversionHebrew to Gregorian Converter
Convert between Hebrew calendar dates and Gregorian calendar dates.
conversionAnniversary Calculator
Calculate upcoming anniversaries and years since a special date.
specialMilestone Date Finder
Find 100-day, 1000-day, or custom milestone dates from a given date.
specialGolden Birthday Calculator
Find your golden birthday (age equals birth day) and its date.
specialHalf Birthday Calculator
Find your half birthday date and calculate half-year milestones.
specialSweet 16 / 21st Birthday
Calculate dates for milestone birthdays (Sweet 16, 21st, 30th, 50th, etc.).
specialVeteran's Day / Memorial Day
Find the date of observance for moving holidays (Veteran's Day, Memorial Day).
specialMother's Day / Father's Day
Calculate Mother's Day and Father's Day dates for any year.
specialThanksgiving Date Finder
Find the date of Thanksgiving (US and Canada) for any year.
specialHoliday Date Finder
Find the date of major holidays (New Year, Christmas, Easter, etc.) for any year.
holidayEaster Date Calculator
Calculate the date of Easter Sunday for any year using the Computus algorithm.
holidayPublic Holiday Calendar
Generate a calendar of public holidays for a selected year and country.
holidayDays Until Next Holiday
Calculate the number of days until the next major holiday.
holidayAdvent Calendar Calculator
Calculate Advent dates and countdown to Christmas Day.
holidayFull Moon & New Moon Dates
Find dates of full moons and new moons for any year.
holidayEquinox & Solstice Calculator
Calculate the dates of equinoxes and solstices for any year.
holidayDaylight Saving Time Dates
Find the start and end dates of Daylight Saving Time for any year and region.
holidayWhat Are Date Calculators?
Our Date Calculators collection provides a comprehensive suite of tools for working with dates, planning events, tracking milestones, and managing schedules. Whether you need to calculate the difference between two dates, determine your age, find the day of the week, or count business days, these calculators deliver accurate results with clear explanations.
From date differences and age calculations to calendar generation, business days, and countdowns, our tools cover every aspect of date handling and planning.
How to Use This Directory
- Search: Type a keyword into the search bar to find specific calculators by name or description.
- Filter by Category: Use the dropdown to narrow down to a specific date topic — each option shows the number of tools available.
- Click to Use: Each card links directly to the tool. Click on any card to start your date calculation instantly.
- Explore Category Pages: Use the "Explore More Time & Date Tools" section to access dedicated pages for other time and date topics.
Why Use Our Date Calculators?
- Comprehensive Coverage: Covers date differences, age, calendars, business days, countdowns, date conversion, special dates, and holidays.
- Accurate & Reliable: Uses precise date algorithms including leap year calculations and calendar rules.
- Free & Accessible: No registration, no fees — use any tool instantly on any device.
- Educational: Many tools show the formulas and principles behind the calculations.
- Professional & Personal Use: Designed for project managers, HR professionals, event planners, and personal use.
❓ Date Calculators FAQ
What types of date calculations can I perform?
You can calculate date differences (days, weeks, months, years), age (years, months, days), day of the week, week numbers, business days, countdowns, add/subtract days/months/years, convert date formats, calculate holidays, find zodiac signs, and more.
How do I calculate the difference between two dates?
Use our Date Difference Calculator. Enter the start date and end date, and the tool will calculate the exact difference in years, months, days, and total days.
How do I calculate my exact age?
Use our Age Calculator. Enter your date of birth, and the calculator will show your exact age in years, months, days, hours, minutes, and even seconds.
How do I find the day of the week for any date?
Use our Day of the Week Finder. Enter a date, and the calculator will tell you which day of the week it falls on.
How do I calculate business days between two dates?
Use our Business Days Calculator. Enter the start and end dates, and the tool will count working days (weekdays) excluding weekends and optionally holidays.
How do I add days to a date?
Use our Add Days to Date calculator. Enter the starting date and the number of days to add, and the tool will compute the resulting date.
How do I set a countdown to a future event?
Use our Countdown to Date calculator. Enter the target date and the tool will show the remaining days, hours, minutes, and seconds.
Are these calculators suitable for professional scheduling?
Yes, our business day and deadline calculators are designed for project management, HR, and professional scheduling applications.
How often are new date calculators added?
We regularly add new calculators based on user requests. If you have a suggestion, please contact us.
Can I use these calculators for legal or official purposes?
While our calculators are accurate, they are provided for informational and planning purposes. For legal or official use, please verify with authoritative sources.