Zone · 14 rides
Date & Time
Ages, countdowns, weekdays, week numbers, time zones and timers.
- CalendarBrowse any month or year from 1900 to 2200 with ISO week numbers, a Monday or Sunday start and today highlighted. Mark your own dates and print it as a clean PDF.
- Workday CalculatorCount working days between two dates or add and subtract business days, skipping weekends and your own holiday list, with a calendar, weekend and holiday breakdown.
- Time Card CalculatorAdd up a week of clock-in and clock-out times with unpaid breaks and overnight shifts: totals in h:mm and decimal hours, overtime and pay estimate, CSV and print.
- Pomodoro TimerFree online Pomodoro timer with 25-minute focus sessions, short and long breaks, a task list and daily stats. Exact in background tabs; optional sound and notifications.
- Age CalculatorExact age in years, months and days from your date of birth, plus total days, weeks, months and hours, the weekday you were born on and a countdown to your next birthday.
- Days Between Two DatesCount the days between two dates, including or excluding the end date, with the span in weeks, months and years, the weekday count, and exact hours when you add times.
- How Many Days Until…Live countdown to any date in days, hours, minutes and seconds, with working days, weeks and presets for Christmas, New Year’s Eve, Valentine’s Day and Halloween.
- What Day Is It? CalculatorFind the day of the week for any date from 1583 to 9999, plus its day-of-year number, ISO week, how many days away it is from today and its weekday in nearby years.
- Week Number CalculatorSee the current week number with its Monday-to-Sunday dates, find the ISO week of any date, switch to US Sunday-start numbering and list every week of the year.
- Leap Year CalculatorCheck whether any year is a leap year with the ÷4, ÷100 and ÷400 rule shown step by step, see the next and previous leap years and list every leap year in a range.
- When Is Friday the 13th?See the next Friday the 13th and how many days away it is, every Friday the 13th in any year and a year-by-year list for a range – every year has one to three.
- Moon Phase CalendarToday’s moon phase with illumination and age, the next new moon, quarters and full moon in your local time, the phase for any date and a month calendar of lunar phases.
- Sunrise & Sunset CalculatorSunrise, sunset, solar noon, day length and civil, nautical and astronomical twilight for any coordinates and date (NOAA algorithm), with city presets and your location.
- Online Stopwatch & TimerOnline stopwatch with lap times and a countdown timer with an alarm. Keyboard shortcuts, a full-screen display and timestamp timing that stays exact in background tabs.