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Date Calculators
Days between dates, add or subtract days, age, business days and other date calculators. 62 free tools that run in your browser, no sign-up needed.
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Today's DateWhat is today's date? Live date in every format: ISO, US/EU, week number, Unix, Hijri, Hebrew.Days Between DatesCount days, weeks, months and business days between two dates.Business Days CalculatorCount working days between dates, excluding weekends and holidays.Day of the Week CalculatorFind the weekday of any date, with Zeller and Doomsday steps.Date CalculatorAdd days to a date or count days between dates.Half Birthday CalculatorFind your half birthday date, the countdown to it and your age in halves.Retirement Date CalculatorFind the exact date you reach retirement age, with a live countdown.Age Difference CalculatorFind the exact age gap between two people in years, months and days.Day of the Year CalculatorFind the day number of any date (1–366), days left, ISO week and quarter, or turn a day number into a date.Anniversary CalculatorHow long you've been together, your next anniversary and traditional and modern gifts by year.Time Since CalculatorLive counter of the time since any date: years, months, days, hours, minutes and seconds.Excel Date ConverterConvert Excel serial numbers to dates and times and back, in the 1900 or 1904 date system.Baby Age CalculatorYour baby's exact age in days, weeks and months, plus the next monthly milestone date.Corrected Age CalculatorChronological and corrected (adjusted) age for preemies from the due date or weeks at birth.Date to Roman NumeralsConvert a date into Roman numerals (MM.DD.YYYY or DD.MM.YYYY) for tattoos and engravings.Dog Heat Cycle CalculatorPredict your dog's next heat dates and fertile window from the last heat and cycle length.Egg Incubation CalculatorCandling, lockdown and hatch dates for chicken, duck, quail, goose and turkey eggs.Expiration Date CalculatorGet the expiry date and days left from a manufacture or opening date plus shelf life.Fiscal Year CalculatorFind the fiscal year, quarter, period and week for any date and any fiscal year start.What Generation Am I CalculatorFind your generation from your birth year: Boomer, Gen X, Millennial, Gen Z or Gen Alpha.Harvest Date CalculatorExpected harvest date and window from planting date and days to maturity, with succession.Hebrew Date ConverterConvert Gregorian dates to Hebrew calendar dates and back, with after-sunset option.Nepali Date ConverterConvert AD dates to Bikram Sambat (BS) and back, with Nepali month names and numerals.Notice Period CalculatorFind when a notice period ends: last working day and days remaining from any notice date.Oil Change Due CalculatorFind your next oil change date and odometer reading from your last change and driving.Persian (Jalali) Date ConverterConvert Gregorian dates to the Persian Jalali (Shamsi) calendar and back, with month names.Seed Starting Date CalculatorWhen to start seeds indoors, transplant and direct sow each crop from your last frost date.30 Days From TodayFind the date 30 days from today or any start date, with weekday and business days.60 Days From TodayFind the date 60 days from today or any start date, with weekday, business days and a calendar.90 Days From TodayFind the date 90 days from today or any date, with weekday, business days and a calendar.Animal Gestation CalculatorDue date, birth window and milestones for goats, sheep, pigs, cows, horses, rabbits and more.Horse Foaling Date CalculatorMare due date, foaling window and pregnancy care calendar from the cover date.Full Retirement Age CalculatorYour Social Security full retirement age, earliest claim date, 62 reduction and Medicare date.Maternity Leave CalculatorPlan maternity leave: start date, paid, PTO and unpaid weeks, and your return-to-work date.Medicare Enrollment Period CalculatorFind your Medicare Initial Enrollment Period, coverage start dates and sign-up deadlines.Sobriety CalculatorCount days, weeks, months and years sober from your sober date, with milestones and money saved.Tax Refund Date EstimatorEstimate when your IRS refund arrives by filing date, e-file or paper, deposit or check.PTO Holiday OptimizerFind the bridge days around US holidays that turn your PTO into the most days off in a row.Age Milestones CalculatorSee when you turn 10,000 days, 1,000 weeks, 500 months or 1 billion seconds old.Baby Leaps CalculatorFind your baby's 10 developmental leap weeks and fussy-period dates from the due date.Birthday Moon PhaseSee the moon phase on the night you were born and which future birthdays fall on a full moon.Chronological Age CalculatorExact age in years, months and days on a test date, using the borrow method for assessments.Day Length CalculatorHours of daylight for any place and date, change vs yesterday and a year chart by latitude.Easter Date CalculatorWestern and Orthodox Easter for any year, with Ash Wednesday, Good Friday and Pentecost.Famous Birthdays by DatePick any date to see famous people born that day, sorted by year, with ages and categories.Length of Service CalculatorYears, months and days of service from hire and end dates, plus your next work anniversary.Months Between DatesExact calendar months and days between two dates, decimal months and a month-by-month list.Who Was President When I Was BornEnter your birth date to see the US president and VP that day, plus every president in your lifetime.Project End Date CalculatorTurn effort hours, team size and workdays into a completion date with a work-day calendar.Weekday CounterCount how many Mondays, Fridays or any weekdays fall between two dates and list them.Working Days Per Month CalculatorWorking days and hours for every month of a year, minus weekends and US federal holidays.What Year Was I Born CalculatorFind your birth year from your age, or from your age on any date, plus an age-by-year table.100 Days From TodayFind the date 100 days from today or any date, with weekday, business days and a calendar.180 Days From TodayFind the date 180 days from today or any date, with weekday, business days and a calendar.6 Months From TodayFind the date 6 months from today or any date, its weekday, day count and business days.Breast Milk Storage CalculatorUse-by date and time for pumped breast milk at room temp, in the fridge or freezer (CDC).Half Marathon Training Plan Generator10 to 16 week half marathon plan from your race date and level, with long runs, taper, paces and .ics.Horse Age CalculatorConvert horse years to human years, see the life stage, or get exact age from a foaling date.ISO 8601 Duration ConverterParse or build ISO 8601 durations like P1DT2H30M and convert them to seconds and h:m:s.Moving Checklist GeneratorEnter your move date and situation for a week-by-week moving to-do list with real dates.Home Inventory ListRoom-by-room home inventory with values, purchase dates, serial numbers and photos; print or CSV.Wedding Invitation Timeline CalculatorWhen to send save-the-dates and invitations, plus your RSVP deadline and final headcount date.
About Date Calculators
Count days between two dates, add or subtract days, weeks or months, find business days or the day of the week for any date. Useful for deadlines, notice periods, contracts and planning events.
Most used here: Today's Date, Days Between Dates and Business Days Calculator.