Uses for the Date Calculators

The date calculators and calendars on timeanddate.com can be used for a wide range of calendrical calculations; some typical uses are listed here, with links to the service most suited. The uses described on this page are:

• Calculate how long something is going to last
• How old are you (or another person)?
• Exactly how old are you?
• Calculate when you a round number of seconds, minutes... old
• Calculate when someone were born based on the death date and age
• Calculate which date it would be in X days
• Which day of week a date is/was
• Links to the date calculators

Calculate how long something is going to last

1. Go to the date duration calculator (new window).
2. Enter the first date in the "Enter start date" fields
3. Enter the final day of the event in the "Enter end date" fields.
4. "Include end date in calculation" should be checked, as the last day should also be counted.
5. Click "Calculate duration" to see the results

Example use: Number of days the Torino Olympics 2006 lasts

How old are you (or another person)?

1. Go to the date duration calculator (new window).
2. Enter the birth date in the "Enter start date" fields
3. Click on the "Today" button in the "Enter end date" section.
4. "Include end date in calculation" should not be checked.
5. Click "Calculate duration" to see the current age

Example use: How old would Elvis have been now?

Exactly how old are you?

Calculate when you a round number of seconds, minutes... old

1. Go to the Birthday calculator (new window).
2. Enter the date fields
3. If you know the time as well, fill in the hour, minutes and seconds as well
4. Optionally change the two drop-downs, "Calculate" and "Frequency".
5. Click "Calculate alternative birthdays"

Example use: Next celebrations after start of year 2000?

Calculate when someone were born based on the death date and age

1. Go to the Date calculator (new window) which can calculate the birth date.
2. In the "Enter date to add or subtract from" fields, enter the death date.
3. In the "Add or subtract..." fields, choose "Subtract" and enter the age at death in the Years, Months, Days fields.
4. Click "Calculate new date!"
5. The Birth date will be listed after "Resulting date:" on the following page.

Example use: Albert Einstein's birth date based on age and death date

Calculate which date it would be in X days

1. Go to the Date calculator (new window).
2. In the "Enter date to add or subtract from" fields, enter the start date.
3. In the "Add or subtract..." fields, choose "Add" and enter the number of days (or any other of the fields - they can be combined).
4. Click "Calculate new date!"

Example use: Which date is it 100 days after May 1, 2005.

Which day of week a date is/was

1. Go to the calendar creation page (new window).
2. Enter year
3. Select country or leave as it is
4. Create calendar
5. A calendar for that year will be displayed, and it will also show the weekday of any day

Date Calculators

• Duration Calculator – count days between two dates
• Date calculator – add (or subtract) days, months, years to a date
• Birthday calculator – Find when you are 1 billion seconds old and more

Related links

• Calendar for year 2008
• Calendar Generator – Create a calendar for any year
• The World Clock – Current time all over the world
• Countdown to New Year