Date & Time

21 tools — all free, all in-browser.

Age CalculatorCalculate exact age in years, months, days, and hours.Use Tool →Date CalculatorAdd or subtract days, weeks, or months from a date.Use Tool →Business Days CalculatorCalculate working days between two dates.Use Tool →Date FormatterFormat any date in 12 different patterns.Use Tool →Unix Timestamp ConverterConvert Unix epoch seconds or milliseconds to readable dates and back.Use Tool →Time Zone ConverterConvert times between world time zones.Use Tool →Week NumberFind the ISO and regular week number for any date.Use Tool →Countdown TimerCount down to any future date and time.Use Tool →Pregnancy Due Date CalculatorEnter your last menstrual period or conception date to get your estimated due date, current week, trimester, and pregnancy milestones.Use Tool →World ClockSee the current time in New York, London, Tokyo, Sydney, Dubai and 15+ cities simultaneously. Add or remove cities freely.Use Tool →Ovulation CalculatorEnter your last period date and cycle length to find your ovulation day, fertile window, next period, and a full calendar view.Use Tool →Time Duration CalculatorCalculate the exact duration between two times or two dates. Get results in hours, minutes, seconds, and decimal formats.Use Tool →Age on Other PlanetsFind out how old you'd be on every planet. Each planet orbits the Sun at a different speed, so your age varies across the solar system.Use Tool →Meeting PlannerFind the best time to meet across multiple time zones. See what time it is for each participant and spot the ideal overlap window where everyone is available.Use Tool →Moon Phase CalculatorFind the moon phase for any date. See the phase name, illumination percentage, and days until the next full or new moon in the 29.5-day lunar cycle.Use Tool →Work Hours CalculatorCalculate total hours worked across multiple time entries. Supports overnight shifts, optional hourly rate for earnings calculation, and weekly totals.Use Tool →Speed Distance Time CalculatorSolve for speed, distance, or time — enter any two values and instantly calculate the third. Supports km/h, mph, m/s, knots, km, miles, hours, minutes, and seconds.Use Tool →Age Difference CalculatorCalculate the exact age difference between two people or any two dates. See the gap in years, months, and days, plus both current ages.Use Tool →Sunrise & Sunset CalculatorGet exact sunrise, sunset, solar noon, and day length for any location and date. Enter coordinates or use your GPS location.Use Tool →Biorhythm CalculatorSee your physical, emotional, and intellectual cycle charts based on your birth date. Find your peak days, low days, and critical transition days.Use Tool →Zodiac Sign CalculatorEnter your birthday to instantly find your Western zodiac sign and Chinese zodiac animal. See your element, traits, ruling planet, and compatible signs.Use Tool →