Time

Enter two dates and the difference is worked out three ways: in days, in weeks, and in calendar parts.

Pick a start date and how far forward or back to count, and the date you land on is shown.

Enter the date of birth, and the age is worked out for whatever day you choose.

Choose what you are counting from and enter the date to see the estimated due date and how far along the pregnancy is.

Look up the week for a date, or go the other way and see which dates a week covers.

Count working days between two dates, with weekends and public holidays removed. Pick a country, since the holidays differ.

Pick a country and a year to see every public holiday with its date and weekday, the bridge days and how many working days the year has.

Choose a year, a country and how many days of leave you would take, and see where the longest breaks are.

Pick two places and a time, and see what the clock says in the other one.

Pick a place and a date to see sunrise, sunset, the length of the day and the three stages of twilight.

Pick a place and a year to see the day length plotted across the year, with the solstices and equinoxes marked.

Pick a holiday or your own date, and the time counts down second by second.

Pick a time, press Start and get a signal when it runs out.

Press Start, and take lap times while the clock runs.