Date & Time Directory

Convert any 24-hour (military) time to 12-hour AM/PM format and vice versa.

Add or subtract days, weeks, months, or years from any date to find the resulting date.

Calculate your exact age in years, months, weeks, and days from your birthdate. See your next birthday countdown and age milestones instantly.

Calculate your total age in days, hours, minutes, and seconds since birth.

See how many days until your next birthday and what day of the week it falls on.

Find your birthstone, birth flower, and zodiac sign from your birth month.

Calculate entitled break times based on shift length and labor law requirements.

Convert between Gregorian calendar dates and the Chinese lunar calendar.

Find the date of Chinese New Year for any year based on the lunar calendar.

Calculate chronological age in years and months for psychological and educational testing.

Create a live countdown to any future date showing days, hours, minutes, and seconds.

Add or subtract days from a date

Calculate the exact number of days, weeks, months, and years between any two dates.

Calculate date of birth from current age or age at a specific date.

Generate a list of all dates between two dates with customizable intervals.

Convert any date to its ordinal day number within the year (1-366).

Convert between calendar dates and Julian Day Numbers used in astronomy and programming.

Count days between two dates

Find the day number (1-366) of any date within its year.

Find what day of week a date falls on

Find when DST begins and ends for any year and location with clock change reminders.

Find how many days are in any month of any year including February in leap years.

Count how many days have passed since any historical date or personal milestone.

Count the exact days remaining until any future date — holidays, deadlines, or events.

See exactly how many days, hours, and minutes remain until Christmas Day.

Count down the days and hours remaining until January 1st of the next year.

Calculate the exact days remaining until your planned retirement date.

Find what decade, century, and millennium any year belongs to.

Convert between hours:minutes format and decimal hours for payroll and billing.

Find the date of Easter Sunday for any year using the computus algorithm.

Calculate total elapsed time between two date-times in days, hours, minutes, and seconds.

Find the date of US Election Day for any year using the first Tuesday after the first Monday rule.

Calculate your exact age in years, months, days, hours, minutes, and seconds from birth date.

Find all Friday the 13th dates in any year or range of years.

Find the dates of all full moons in any year with moon phase names.

Find which generation you belong to (Gen Z, Millennial, Gen X, Boomer) from birth year.

Find your golden birthday — when your age matches your birth day number.

Find the exact date of your half birthday — six months from your birth date.

Convert between Gregorian and Hebrew calendar dates with Jewish holiday awareness.

Calculate hours between times

Calculate total hours worked per day or week from start time, end time, and breaks.

Find how many days remain until the next Friday or any specific weekday.

Calculate your exact age right now in years, months, days, hours, and seconds.

Find the ISO 8601 week number for any date and the start/end dates of any week.

Check if any year is a leap year and list all leap years in a given range.

Calculate the number of complete months between two dates.

Calculate overtime hours and pay from your work schedule and overtime threshold.

Determine pay period dates for weekly, biweekly, semi-monthly, and monthly schedules.

Convert between Gregorian, Hijri, and the Persian Solar Hijri (Jalali) calendar.

Calculate pregnancy due date from exact conception date instead of last menstrual period.

Find which fiscal or calendar quarter any date falls in and the quarter start/end dates.

Find the estimated start date of Ramadan for any year based on the Islamic lunar calendar.

Calculate exactly how long you have been in a relationship in years, months, and days.

Count the remaining school days until summer break or graduation.

Find the exact dates of solstices and equinoxes for any year and hemisphere.

Calculate the length of a work shift including overnight shifts that cross midnight.

Calculate days, months, and years of sobriety from your clean date.

Calculate average, best, and worst lap times from a list of split times.

Find the date of Thanksgiving for any year in US and Canadian calendars.

Add and subtract time values

Calculate work hours and overtime

Calculate duration between dates/times

Calculate exact time elapsed since a specific date and time in years, days, hours.

Calculate the exact time remaining until a specific date and time down to the second.

Convert times between time zones

Count down to your next vacation with days and hours remaining.

Count down to your wedding day with days, hours, and planning milestone reminders.

Calculate the number of weeks between two dates or weeks from now to a date.

Find what day of the week any date falls on — past, present, or future.

Calculate years, months, and days since your work start date for anniversary milestones.

Find the best meeting time across multiple time zones for international calls.

Calculate the decimal fraction of a year between two dates for financial calculations.

Find the exact date ranges for all 12 zodiac signs including cusps.