70 tools

Date and time

70 free date and time tools, all running in your browser with no sign-up.

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Age calculator in years, months and daysFind your exact age in years, months and days from your date of birth to today or any date, plus total months, weeks and days.
Age in days calculatorSee how many days you have been alive from your birth date to today or another date, with the same span in weeks, hours and years.
Age in weeks calculatorWork out your age or your baby's age in whole weeks plus leftover days from the date of birth, with the decimal value and total days.
Age in months calculatorCalculate age in whole calendar months plus extra days from the date of birth, the usual way to track a child's age up to about 3.
Age in hours, minutes and secondsFind how many hours, minutes and seconds you have lived since the moment of birth, using the birth date and time and a second date and time.
How old will I be in a given yearType a future or past year to see the age you reach in it, the date and weekday of your birthday, and your age at the start and end of it.
Next birthday countdownSee how many days are left until your next birthday, which weekday it falls on and the age you will turn.
What day of the week was I bornFind the weekday you were born on from your birth date, with its day of the year, whether it was a leap year and the matching Hijri date.
Age difference calculatorEnter two birth dates to get the age gap in years, months and days, in total days and whole months, and who is older.
Retirement date calculator by ageFind the date you reach retirement age from your birth date and the retirement age you set, with the time and days left until then.
Hijri age calculator from a Gregorian dateEnter your Gregorian birth date to get your age in Hijri years, months and days on the Umm al-Qura calendar, plus your Hijri birth date.
Age from a Hijri birth dateEnter your Hijri birth day, month and year to get your Hijri and Gregorian age in detail, your Gregorian birth date and the weekday.
Next Hijri birthdaySee when your next birthday falls on the Hijri calendar, its Gregorian date, how many days are left and the Hijri age you will turn.
Generation calculator by birth yearType your birth year to find your generation: Millennials, Gen Z, Gen X or another, with the generation's birth years and the source.
Age milestones: 10,000 days and a billion secondsFind when you turn 10,000 days, 20,000 days and one billion seconds old, with a table of day milestones, weekdays and which have passed.
Birthday weekday by yearSee which weekday your birthday falls on this year and in the years ahead, in a table with the date and your age each year.
School entry age calculatorCheck whether your child meets the school or kindergarten entry age on a set date, their age on that day and when they reach it.
Age by birth year calculatorEnter just a birth year to see how old people born that year are now: their age before and after this year's birthday.
Days between dates calculatorCount the days between two dates, shown also as weeks and days and as years, months and days, with an option to count the end day.
Add days to a dateAdd any number of days to a date and see the resulting date and weekday, such as a deadline 30 or 90 days from now.
Subtract days from a dateSubtract a number of days from a date to find the earlier date and its weekday, such as the date 40 or 100 days ago.
Add or subtract weeks from a dateAdd weeks to a date or subtract them to get the resulting date, such as an appointment 6 weeks later or 12 weeks earlier.
Add or subtract months from a dateAdd or subtract calendar months from a date, with month-end handling: 31 January plus 1 month becomes the last day of February.
Add or subtract years from a dateAdd or subtract calendar years from a date to get the result, with 29 February handled in years that are not leap years.
Date add and subtract calculatorAdd or subtract a combined period of years, months, weeks and days from a date in one step and get the resulting date.
Business days between datesCount working days between two dates with your weekend (Friday-Saturday or Saturday-Sunday) and minus public holidays.
Add business days to a dateAdd or subtract working days from a date, skipping the weekend you choose, to find the real delivery or deadline date.
ISO week number calculatorFind the ISO 8601 week number of any date, with the week-year and the Monday start and Sunday end dates of that week.
ISO week number to dateEnter a year and ISO 8601 week number to get the Monday that starts it and the Sunday that ends it.
Day of the year calculatorFind where a date falls in its year, from day 1 to 365 or 366, plus the days left until year end and the share of the year passed.
Day of year to date converterEnter a year and a day number from 1 to 366 to get the matching calendar date and the weekday it falls on.
Days until a dateFind how many days are left until a date such as a trip, exam or event, or how many have passed if the date is behind you.
Leap year checkerCheck whether a year is a leap year under the Gregorian rule, with its day count, February length and the previous and next leap years.
Quarter of the year calculatorFind which quarter a date falls in, with the quarter start and end and days left, including fiscal years that start in any month.
Count a weekday between two datesCount how many times a weekday such as Friday or Monday occurs between two dates, with a table of every weekday in the range.
Months between dates calculatorCount the whole months between two dates plus the extra days, also shown as years and months, for contract and rent periods.
Hours between two times calculatorFind the hours and minutes between two clock times, including spans past midnight, with decimal hours and total minutes.
Add or subtract time calculatorAdd hours and minutes to a clock time or subtract them, and see the resulting time and whether it moves to another day.
Time duration sum calculatorAdd up a list of durations written as H:MM or H:MM:SS and get the total, the average and the total in decimal hours.
Minutes to hours and minutes converterTurn a number of minutes into hours and minutes (H:MM) plus decimal hours, for example 135 minutes = 2:15 = 2.25 hours.
Decimal hours to hours and minutesConvert decimal hours such as 7.75 into hours and minutes (7:45), the format often needed for payroll and timesheets.
Hours and minutes to decimal hoursConvert hours, minutes and seconds into decimal hours for hourly pay, for example 7 hours 45 minutes = 7.75 hours.
Overtime hours calculatorWork out overtime hours from total hours and the regular limit, with regular pay, overtime pay and the total.
Sleep duration calculatorWork out how long you slept from bedtime and wake time, and compare it with the 7 hours or more advised for adults.
Bedtime calculator by sleep cyclesFind when to go to bed so you wake at the end of a sleep cycle, from your wake time, cycle length and time to fall asleep.
Shift length calculatorGet paid shift length from start time, end time and unpaid break, plus weekly hours for the number of shifts you work.
Shift end time calculatorFind when your shift ends from the start time, working hours and break length, including night shifts past midnight.
Time as a percentage of the daySee what percentage of the day has passed at any clock time and how much time is left until midnight.
Countdown to a time calculatorCount how long is left until a set time today or several days ahead, in days, hours, minutes and total seconds.
Seconds to HH:MM:SS converterConvert a number of seconds into H:MM:SS and into days and hours, with the total in decimal hours and minutes.
HH:MM:SS to seconds converterConvert a time written as H:MM:SS or M:SS into total seconds, minutes, decimal hours and milliseconds.
Multiply or divide time calculatorMultiply a duration by a number or divide it, such as 1:45 × 12 or 8 hours ÷ 3, and get the result in hours and minutes.
Time rounding calculatorRound a clock time to the nearest 5, 6, 10, 15 or 30 minutes, up, down or nearest, as attendance and payroll systems do.
Day of the week calculatorFind which day of the week any Gregorian date falls on, from year 1 to 9999, with its day of the year and ISO week number.
Weekdays in a month counterCount how many times each weekday occurs in a chosen month, such as the number of Fridays in October, with their dates and a table for all seven days.
Monthly calendar generatorShow the calendar of any Gregorian month as a weekly grid, with the week starting on Saturday, Sunday or Monday and optional Hijri dates.
Hijri month lengths (Umm al-Qura)See whether each Hijri month has 29 or 30 days in the Umm al-Qura calendar, with Gregorian start and end dates and the total days in the year.
School week calculatorFind the school week number for any date, plus total term weeks and the school days done and left, based on your weekend days.
Pay periods in a year calculatorCount how many paydays fall in a given year for weekly, biweekly or every-4-weeks pay, and see whether the year has an extra pay period.
Unix epoch day numberConvert any date to its day number since 1970-01-01, with the Unix timestamp at midnight UTC in seconds and in milliseconds.
Julian day number calculatorCalculate the Julian Day Number of any Gregorian date, with the Julian Date at midnight UT, the Modified Julian Date and the Rata Die count.
Nth weekday of the month calculatorFind the date of a weekday by its position in the month, such as the second Sunday in May or the last Thursday in November, for any year.
Easter date calculator (Western and Orthodox)Find the Western and Orthodox Easter dates for any year from 1583 to 9999, with Good Friday, Palm Sunday and the Sham el-Nessim holiday.
Century and millennium calculatorFind which century and millennium any year from 1 to 9999 belongs to, with the century start and end, the year within it and its decade.
Days in a month calculatorFind how many days any Gregorian month has in a given year, the weekday it starts and ends on, and a table of all month lengths that year.
Friday the 13th finderList every Friday that falls on the 13th of a month between two years you choose, with the total count for the whole period.
Same calendar year finderFind the Gregorian years whose calendar matches a given year day for day, so you can reuse an old calendar or see when yours repeats.
All dates of a weekday in a yearList every date of a chosen weekday across a whole year, such as all Fridays in 2026, with the total of 52 or 53 days.
ISO week number calculatorGet the ISO 8601 week number for any date, with the week-numbering year, the Monday and Sunday of that week and the 52 or 53 weeks in the year.
Fiscal quarter calculatorFind which quarter a date falls in based on when your fiscal year starts, with the quarter start and end dates and the days gone and left.