Date & Time

Find the ISO week number, day of the week, day of the year and quarter for any date — and the dates of any week number.

How many days until Christmas, New Year, Easter, Halloween, Thanksgiving, Valentine's Day, Mother's Day and more — or a countdown to any date you choose.

List US federal holidays (with observed dates) and England & Wales bank holidays for any year — calculated from the official rules.

Show a month calendar for any month and year, starting on Sunday or Monday, with ISO week numbers — ready to print or download as CSV.

Find your half birthday, how long you've been together, your next anniversary and the traditional anniversary gift for each year.

Convert between 12-hour and 24-hour (military) time, and between hours:minutes and decimal hours for timesheets (1:45 = 1.75).

Convert a calendar date to the astronomical Julian Day Number, Modified Julian Date and the ordinal 'Julian date' (YYDDD / day of year) used in manufacturing and the military.

Find your Western star sign from your birth date and your Chinese zodiac animal and element from your birth year.

Find which generation you belong to — Boomer, Gen X, Millennial, Gen Z, Gen Alpha or Beta — from your birth year, with each generation's year range.

Find the date you'll reach retirement age — any age you choose or your US Social Security full retirement age — and how long there is to go.

Check how many days you've spent in the Schengen Area in the last 180 days, how many you have left, and the latest date you can stay on your next trip.

Plan how to shift your sleep before and after a flight across time zones — how many days jet lag may last and a day-by-day bedtime schedule.

Check whether a year is a leap year, and find the dates of the March and September equinoxes and June and December solstices — the astronomical start of each season.

List every payday for the year from your first pay date and pay frequency, and spot the months with three biweekly paychecks.

Calculate exact age in years, months and days from a date of birth — plus total days lived, the next birthday and the day you were born.

Count the days, weeks, months and years between two dates, including or excluding the end date, and the number of business days.

Find the date a number of days, weeks, months or business days before or after any date — for deadlines, notice periods and due dates.

Work out the hours and minutes between two times — overnight shifts, unpaid breaks and decimal hours for timesheets included.

Add or subtract lists of hours and minutes — like 1:30 + 2:45 − 0:20 — and get the total in h:mm, decimal hours and days.

Convert dates between the Islamic Hijri calendar and the Gregorian calendar using the Umm al-Qura calendar (Saudi Arabia) or the tabular Islamic calendar.

Generate a rotating shift schedule for your teams — 2-2-3 Panama, DuPont, 4-on-4-off, 24/48 and more — with coverage and hours per week.

Build a day-by-day revision timetable up to your exams — subjects rotated fairly, weighted by difficulty, with review days before the exam.

Turn a list of classes into a clean weekly timetable — grouped by day, sorted by time, with clash detection and total hours.

Convert a time between time zones and see the same moment in 40+ cities at once — with daylight saving handled automatically — to plan meetings across the world.

Find when the clocks change in any time zone and year — the exact date and time daylight saving time starts and ends, and the offset before and after.

A free online countdown timer with alarm, a stopwatch with laps, and a live countdown to any date — works full-screen and keeps running in the background.

Set an alarm in your browser — pick a time and a sound, and it rings even if you switch tabs. Great for naps, cooking and reminders.

Stay focused with the Pomodoro technique — 25-minute focus sessions, 5-minute breaks and a longer break every 4 rounds, with sounds and a session counter.