Date & Time Calculators

Work out ages, date differences, business days, durations, countdowns and week numbers in seconds.

Find your exact age in years, months and days, plus a countdown to your next birthday.

Measure the exact time between two dates in years, months, days, weeks and total days.

Count the total days between two dates, both exclusive and inclusive of the end date.

Add any number of days to a date and get the resulting calendar date and weekday.

Subtract any number of days from a date and get the resulting calendar date and weekday.

Count working days (Monday–Friday) between two dates, excluding weekends and optional holidays.

Calculate the duration between two clock times, including overnight spans.

Find the precise difference between two dates and times in days, hours, minutes and seconds.

Set a target date and time and watch a live countdown tick down in real time.

Get the ISO-8601 week number for any date, plus the day of year, quarter and week range.