Date & Time

Date and time tools: count the days between two dates, add or subtract time, work out ages, working days, time zones and durations. Calendar rules such as leap years are handled for you.

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Age Calculator Compute your exact age in years, months and days from a birth date.
Date Calculator (Add/Subtract) Find the resulting date and weekday by adding or subtracting days, months and years from a start date.
Date Difference Calculator Compute the exact span between two dates in years, months, days and totals.
Time Zone Difference (World Clock) Pick two cities to see the time difference between them and the current local time in each.
Age Difference Calculator Calculate the difference between two dates in years and days.
Work Hours Calculator Calculate hours worked from start and end times minus breaks.
On This Day in History See major historical events that happened on a given month and day — defaults to today.
Time Duration Calculator Calculate the duration between two times as hours and minutes, total minutes and decimal hours.
Timestamp (Unix) Converter Convert a Unix timestamp to a date, or a date to a Unix timestamp (UTC and ISO 8601).
Next Birthday Countdown Count the days until your next birthday and the age you will turn.
Days Until Date Calculator Count the number of days from today until a target date.
Decimal Hours Converter Convert hours and minutes to decimal hours.
Week Number (ISO) Calculator Calculate a date’s ISO week number, day of the year and the days remaining in the year.
Business Days Calculator Count the number of business (weekday) days between two dates, excluding weekends.
Anniversary Calculator Calculate how many years and days have passed since a historical date, and the weekday it fell on.
Day of the Week Calculator Find out which day of the week any date falls on.
Time Converter Convert time between seconds, minutes, hours, days and weeks.
Moon Phase Calculator Enter any calendar date and instantly see the lunar phase (new moon, first quarter, full moon, last quarter and the crescent/gibbous stages in between), the percentage of the moon's disk that is illuminated, and the moon's age in days since the last new moon. Based on the 29.53-day synodic month referenced to the known new moon of January 2000.
The Year You Were Born Find your age and the major historical events from the year you were born.
Quarter of the Year Calculator Find which fiscal quarter a date falls in and the day within it.
Leap Year Checker Find out whether a year is a leap year, how many days it has and the next leap year.
Net Working Hours Calculator Calculate net working hours by subtracting break time from a shift’s length. Useful for timesheets, payroll and scheduling.
Easter Date Calculator Calculate the date of Gregorian Easter Sunday for any year with the computus algorithm.
Historical Events by Year List the major historical events that happened in a given year, in date order.
Half Birthday Calculator Calculates your half-birthday (six months from your birthday), the next upcoming one, and the days remaining until it.
Time Zone Offset Calculator Convert a clock time from one UTC offset to another and see whether the result falls on the same day, the next day, or the previous day.
Time Zone Meeting Planner Finds the overlapping working hours between two time zones from their UTC offsets and a shared working day.
Working Hours Between Dates Calculator Counts business days (Mon–Fri) between two dates and multiplies by hours per day to give total working hours.
Study Time Calculator Estimates how many hours you should study each week and over a term based on your credit load and study ratio.
Years Between Dates Calculator Find the number of years between two dates, as a decimal, whole years, and total days.
Day of Year Calculator Finds the ordinal day-of-year number (1 to 366) for any calendar date, plus the days remaining in the year and whether it is a leap year.
Doomsday Algorithm Weekday Calculator Compute the day of the week for any date using the doomsday method, and see the year's doomsday weekday and the day-of-year number.
Add Hours and Minutes Calculator Adds a number of hours and minutes to a starting clock time and shows the resulting time.
Equation of Time Calculator Compute the equation of time in minutes for any day of the year, the difference between apparent solar time (sundial) and mean clock time.
Quarter from Date Calculator Tells you which calendar quarter and fiscal quarter a given date falls in, based on your fiscal-year start month.
Windows FILETIME Converter Convert Windows FILETIME 100-nanosecond ticks (counted since 1601-01-01 UTC) to a readable date and time, or back.
Time Blocking Calculator Calculates how many focus blocks fit in your available time, plus total productive minutes and break time, given block and break lengths.
Subtract Business Days Calculator Subtracts a number of working days (skipping Saturdays and Sundays) from a start date to find the resulting business date.
Weekends Left Calculator Estimate how many weekends you have left based on your current age and a target life-expectancy age.
Ordinal (Julian) Date Converter Convert between a 5-digit YYDDD ordinal (Julian) date and a standard calendar date in both directions.
Modified Julian Date Calculator Converts a Gregorian calendar date to its Julian Date and Modified Julian Date (MJD = JD − 2400000.5), evaluated at 00:00 UT.
Add Business Days Calculator Add a number of business days (skipping Saturdays and Sundays) to any start date and get the resulting working date.
Moon Phase Date Calculator Finds the Moon phase, age and illumination percentage for any calendar date using the synodic month.
Bengali Calendar Converter Approximately converts a Gregorian date to the Bengali San (BS) calendar year and month, with the Bengali New Year around April 14.
Decimal Year Calculator Converts a calendar date to its decimal-year representation: year + (day-of-year − 1) / days-in-year, accounting for leap years.
Deep Work Hours Calculator Estimate how many hours of deep, focused work you actually get each week after subtracting meetings and admin time and applying a focus-efficiency factor.
ISO 8601 Duration Converter Converts between ISO 8601 duration strings like P1DT2H30M and total seconds, with a humanized breakdown.
HH:MM to Decimal Hours Calculator Converts a time in HH:MM format to decimal hours, or decimal hours back to HH:MM, with the total minutes.
Epoch Milliseconds Converter Converts a JavaScript millisecond Unix timestamp to a UTC date and back, including the equivalent seconds epoch.
Eisenhower Matrix Time Calculator Splits your total weekly hours across the four Eisenhower quadrants from your urgent/important percentages, highlighting Q2 focus time.
Dublin Julian Date Calculator Converts a Gregorian calendar date to its Dublin Julian Date (DJD = JD - 2415020), with the epoch at noon UT on 31 December 1899 (often written 1900 January 0.5).
Japanese Era (Nengō) Converter Converts a Gregorian date to its Japanese era name and era year, such as Reiwa or Heisei.
Juche Calendar Converter Converts a Gregorian calendar year to the North Korean Juche year, where Juche 1 corresponds to 1912.
Sidereal Time Calculator Computes Greenwich and local mean sidereal time from a UTC date, time and observer longitude.
Cron Next Run Calculator Parse a 5-field cron expression and compute the next time it will run from a given start datetime, with minutes until.
Goal Milestone Calculator Splits the gap between your current progress and target into evenly spaced milestones and shows the pace needed to hit your deadline.
Last Day of Month Calculator Find the final calendar date of any month, how many days it has and which weekday it ends on.
Months Between Dates Calculator Count the whole months, leftover days and decimal months between two calendar dates.
Nth Weekday of Month Calculator Find the date of the first, second, third, fourth, fifth or last chosen weekday in any month.
Pomodoro Session Calculator Calculate how many pomodoro sessions a task needs and the total time with breaks.