Time & Dates

Time and date calculators: age, duration, timezones, day counter, sleep cycles and more.

Age Calculator

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

Calculate the difference between dates or add/subtract days, weeks, months, or years from a date.

Add, subtract and convert time units. Perfect for calculations with hours, minutes and seconds.

Calculate total hours worked by adding multiple periods and subtracting breaks.

Calculate the exact duration between two dates and times in days, hours, minutes, and seconds.

Count the days remaining or elapsed since a specific date.

Discover what day of the week any calendar date was or will be.

Convert times between different world time zones and compare multiple cities.

Calculate hours worked, overtime, and weekly pay based on your clock punches.

Calculate the best times to sleep or wake up based on 90-minute sleep cycles.