Date & Time Tools

Age, durations, time zones and calendars. · 17 tools

Add Days to DateAdd or subtract a number of days, weeks, months or years from a date and see the resulting date and its day of the week.Age CalculatorCalculate exact age in years, months and days between a birth date and any target date, plus total days and the countdown to the next birthday.Business Days CalculatorCount working days (Monday-Friday, minus any holidays you list) between two dates, or add a number of business days to a start date.Countdown TimerA live countdown to any target date and time, updating every second in days, hours, minutes and seconds, switching to a count-up once it passes.Date Difference CalculatorFind the exact gap between any two dates: total days, weeks, hours and minutes, plus a years+months+days breakdown, in either order.Date Format ConverterSee any date rendered in every common textual format at once: ISO 8601, US, EU, long form, RFC 2822 and more.Day of the Week FinderFind out which day of the week any date, past or future, falls on, plus whether it is a weekday or weekend and how far it is from today.Julian Date ConverterConvert between a Gregorian calendar date and its astronomical Julian Day Number or Modified Julian Date.Leap Year CheckerCheck whether any year is a leap year under the Gregorian calendar rule, with the exact rule that applied and the nearest leap years.Moon Phase CalculatorFind the Moon’s phase, illumination percentage and age in its cycle for any date, plus days remaining until the next full or new moon.Printable Calendar GeneratorGenerate a clean, printable one-month calendar grid as downloadable HTML, with a live preview and a choice of Monday or Sunday week start.Sunrise Sunset CalculatorEstimate sunrise, sunset, day length and solar noon (in UTC) for any date and latitude/longitude using the standard NOAA solar approximation.Time Duration CalculatorCalculate the exact elapsed time between two date-and-time instants as days, hours, minutes and seconds, plus totals in each unit.Time Zone ConverterConvert a date and time from one IANA time zone to another, DST-aware, plus a full table of that same instant across every common time zone.Timesheet CalculatorPaste a list of shift times (HH:MM-HH:MM, one per line) to total worked hours, flag overtime past a daily threshold, and estimate pay.Week Number CalculatorFind the ISO-8601 week number for any date, its week-numbering year, and the Monday-to-Sunday date range of that week.World ClockWatch live current time update every second across any set of time zones you choose, each shown with its current UTC offset.

Calculate ages and date differences, add business days, convert between time zones and plan around sunrise or moon phases. Time-zone tools use the IANA time-zone database built into your browser, so daylight-saving changes are handled correctly.

Dates are shown in your locale’s format, and every result can be copied with one click.

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