Date & Time calculators
Age, date difference, business days, time zones, countdowns and time math.
51 free tools
Most used
Age CalculatorFind your exact age in years, months, days — and your next birthdayBusiness Days CalculatorCount working days between dates or add business days to a deadlineChinese Lunar Calendar ConverterConvert Gregorian dates to Chinese lunar dates and back, leap months includedCountdown CalculatorHow many days, hours and minutes until your big date?Date CalculatorAdd or subtract days, weeks, months or years from any dateDate Difference CalculatorDays, weeks, months and years between any two datesKorean Age CalculatorSee your Korean age, “year age” and international age side by sideMilitary Time ConverterConvert 12-hour AM/PM time to 24-hour military time and backNepali Date ConverterConvert English (AD) dates to Nepali Bikram Sambat (BS) dates and backOnline StopwatchA free, accurate stopwatch with lap and split timesOnline TimerSet a countdown for any minutes or seconds, with an alarm soundTime CalculatorAdd or subtract hours, minutes and seconds — or add time to a clockTime Duration CalculatorHours and minutes between two times — overnight shifts includedTime Zone ConverterConvert any date and time between world time zones, DST includedWork Hours CalculatorAdd up a weekly timesheet with breaks, overtime and gross pay
More date & time tools
Age Difference CalculatorFind the exact age gap between two people in years, months and daysChinese Zodiac CalculatorFind your Chinese zodiac animal and element from your exact birth dateDaily Schedule PlannerTurn a task list into a time-blocked daily schedule that fits your dayDay of the Week CalculatorFind the weekday for any date in the past or future — instantlyDay of the Year CalculatorGet the day number (1–366) for any date and how many days are leftHijri Date ConverterConvert Gregorian dates to the Islamic (Hijri) calendar and backJulian Date ConverterConvert calendar dates to Julian dates (YYDDD) and astronomical JD — and backLife Milestones CalculatorFind when you turn 10,000 days, 1 billion seconds and other fun age milestonesMoon Phase CalculatorMoon phase, illumination and next full moon for any dateOnline Alarm ClockSet a free alarm in your browser — with sound, snooze and a live countdownPersian Calendar ConverterConvert Gregorian dates to the Persian Solar Hijri (Jalali) calendar and backPomodoro TimerA free 25/5 focus timer with long breaks and a session plannerPrintable Calendar GeneratorMake a clean monthly or yearly calendar with holidays and week numbersProject Timeline CalculatorSchedule tasks from a start date or work back from a deadline, skipping weekendsSolstice and Equinox CalculatorExact equinox and solstice times for any year, in your own time zoneSunrise Sunset CalculatorSunrise, sunset, golden hour and day length for any place and dateTime to Decimal CalculatorConvert hours and minutes to decimal hours for payroll — and backTime Zone Meeting PlannerFind meeting times that fit everyone’s working hours across time zonesWeek Number CalculatorFind the ISO week number of any date, or the dates in any weekWorld ClockLive local time in cities around the world, side by sideZodiac Sign CalculatorFind your star sign, element and ruling planet from your birthday4-4-5 Retail CalendarBuild a 4-4-5, 4-5-4 or 5-4-4 fiscal calendar and look up any date’s weekAnniversary CalculatorSee how long you’ve been together and when the next milestone landsDaylight Saving Time CalculatorWhen do the clocks change? DST start and end dates for any yearEaster Date CalculatorFind Western and Orthodox Easter Sunday for any year from 1583 to 4099Ethiopian Calendar ConverterConvert Gregorian dates to the Ethiopian calendar (and back) instantlyFiscal Quarter CalculatorSee which fiscal quarter and fiscal year any date falls inGeneration CalculatorEnter a birth year to see if you are a Boomer, Gen X, Millennial, Gen Z or AlphaHalf Birthday CalculatorFind your next half birthday — or quarter and three-quarter birthdaysHebrew Date ConverterConvert Gregorian dates to the Jewish calendar and back, sunset-awareHoliday Date CalculatorFind the exact date of Thanksgiving, Memorial Day, Labor Day and moreLeap Year CheckerCheck any year instantly and see the next leap years and Feb 29 weekdaysLife in Weeks CalculatorSee your life as weeks lived and weeks left — a perspective check in one numberMayan Calendar ConverterFind the Maya Long Count, Tzolk’in and Haab’ date for any dayThai Buddhist Calendar ConverterConvert Buddhist Era (พ.ศ.) years and dates to AD/CE and backYear Progress CalculatorSee how much of the day, week, month, quarter and year is done