Date & Time Tools
Count the days, hours and seconds.
Age Calculator Enter a date of birth to get the exact age in years, months and days, with totals in days and weeks. Date Difference Calculator Pick two dates to see the number of days, weeks, and the full years-months-days breakdown between them. Business Days Calculator Count working days between two dates, skipping weekends and any holidays you list. Countdown Timer Set a duration and count down to zero, with start, pause and reset controls. Date Add and Subtract Add or subtract years, months, weeks and days from a date to find the resulting date. Online Stopwatch Time anything to the centisecond, record laps, and pause or reset whenever you need. Week Number Calculator Find the ISO 8601 week number for any date, plus its week-year and weeks in the year. Day of the Week Calculator Find the weekday for any date, with its ISO weekday number and day of the year. Leap Year Checker Check if a year is a leap year, with days in the year, February's length and upcoming leap years. Time Zone Converter Convert a date and time between any two time zones, with correct daylight saving and UTC offsets. Time Duration Calculator Find the duration between two clock times in hours and minutes, decimal hours and total minutes. Hours Calculator Calculate worked hours between two times, minus a break, with optional pay at an hourly rate. Sleep Calculator Get bedtimes or wake-up times aligned to 90-minute sleep cycles so you wake refreshed. Pomodoro Timer Work in focused sessions with short and long breaks using a customisable Pomodoro timer. Due Date Calculator Estimate a pregnancy due date from the last menstrual period, with gestational age and trimester. Countdown to Event Count down the days, hours, minutes and seconds to any date and time, updating live.