Time & Date Calculators
Durations, date differences, deadlines and time zones.
- Add Days Calculator Add or subtract any number of days from a date to find the resulting date and weekday, with the weekday-only equivalent and common offsets.
- Age Calculator Find exact age in years, months and days from a date of birth, with totals in months, weeks, days and hours and the next birthday.
- Birthday Calculator Count down to your next birthday, find the weekday it falls on and the day you were born, plus your star sign and birthstone.
- Business Days Calculator Count the business days between two dates, excluding weekends and any holidays you list, with the calendar breakdown and working hours.
- Countdown Calculator Count down to any date and time in days, hours and minutes, with totals in hours, minutes and seconds — for events, launches and New Year.
- Date Calculator Add or subtract years, months, weeks and days from any date to find the resulting date and weekday, with month-end dates handled.
- Date Difference Calculator Find the difference between two dates in years, months and days, plus totals in weeks, days, hours, minutes and weekdays.
- Day of the Week Calculator Find the day of the week for any date in history or the future, with the day of the year and the Zeller's congruence working.
- Days Between Dates Calculator Count the days between two dates, with or without the end date, split into weekdays and weekend days and into weeks and days.
- Days Until Calculator Count the days until any date — a holiday, birthday or event — with weeks, weekdays, weekends and sleeps, or the days since a past date.
- Deadline Calculator Find a deadline a number of calendar or business days after a start date, skipping weekends and holidays, with weekend roll-over.
- Decimal Time Converter Convert decimal hours to hours, minutes and seconds — or hours and minutes to decimal hours — for timesheets, payroll and invoicing.
- Half Birthday Calculator Find your half birthday — six months after your birthday — with a countdown, the age you turn and the exact midpoint between birthdays.
- Hours Calculator Find the hours and minutes between two times — including overnight and across dates — less any break, in hours, decimal and minutes.
- Lap Average Calculator Average a set of lap times with the total, fastest and slowest laps, pacing consistency, each lap against the average, and speed.
- Leap Year Calculator Check whether any year is a leap year with the rule explained, find the previous and next leap years, or count leap years in a range.
- Military Time Converter Convert standard 12-hour am/pm time to 24-hour military time and back, with how it is said aloud, like fourteen thirty hours.
- Minutes to Hours Calculator Convert minutes to hours and minutes and to decimal hours — or hours to minutes — with seconds and days, and the working shown.
- Months Between Dates Calculator Find the number of months between two dates — whole months and days, as a decimal, and by average month length — plus months touched.
- Moon Phase Calculator Find the Moon's phase, age and illumination for any date, with the exact times of the next new, first quarter, full and last quarter moons.
- Sunrise Sunset Calculator Find sunrise, sunset, solar noon, day length and civil twilight for any date and place, in the local time zone with daylight saving applied.
- Time Addition Calculator Add up a list of times and durations — like 1:45, 2h 30m or 50m — or subtract some, to get the total in h:mm:ss, words and decimal hours.
- Time Card Calculator Total a week of shifts from start and end times and breaks, split regular and overtime hours, and work out pay with an overtime rate.
- Time Division Calculator Divide a duration by a number to split it into equal parts, or by another duration to see how many times it fits, with remainders.
- Time Duration Calculator Find the exact duration between two times to the second — in hours, minutes and seconds, h:mm:ss, decimal hours and total seconds.
- Time Multiplication Calculator Multiply a duration in hours, minutes and seconds by any number, such as a 1:45:30 task repeated 6 times, with the total in h:mm:ss and decimal hours.
- Time Zone Converter Convert a date and time between world time zones — London, New York, Karachi, Dubai, India, Tokyo and more — with daylight saving applied.
- Timecode Calculator Add, subtract and convert SMPTE timecode at 23.976, 24, 25, 29.97 drop-frame, 30, 50, 59.94 or 60 fps, with frame counts and real running time.
- Timesheet Calculator Total timesheet entries by client, project or task, round them to a billing increment, and work out the amount at an hourly rate.
- Unix Timestamp Converter Convert a Unix timestamp (seconds or milliseconds since 1970) to a date and time in UTC and any time zone, or a date back to a timestamp.
- Week Number Calculator Find the ISO week number of any date, with the week's Monday-to-Sunday dates and the US week number — or the dates of any week.
- Working Hours Calculator Find hours worked per day, week and year from start and end times and unpaid breaks, including overnight shifts, with optional pay.
- Years Between Dates Calculator Find the number of years between two dates — whole years, decimal years and years, months and days — with the leap days crossed.