Uses for the Date Calculators

The date calculators and calendars on timeanddate.com can be used for various calendrical calculations. Some typical uses are listed on this page. They include:

• Calculate the duration of an event.
• How old are you (or another person)?
• Exactly how old are you (with more precise results)?
• Calculate your age by approximate days, weeks, hours, minutes and seconds.
• Calculate when someone was born based on their age and, if applicable, the date of their death.
• Calculate what the date will be in X days.
• Calculate which day of the week a date is/was.
• Links to the date calculators.

Calculate an event's duration

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 on "Calculate duration" to see the results.

Example use: The number of days the Torino Olympics 2006 lasted.

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 on "Calculate duration" to find out one's current age.

Example use: How old would Elvis be today?

Exactly how old are you?

Calculate your age by approximate hours, minutes and seconds

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 on "Calculate alternative birthdays".

Example use: How many minutes have passed since you were born?

Calculate when someone was born based on their age and, if applicable, their date of death

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 on "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 the 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 on "Calculate new date!".

Example use: What was the date at 100 days after May 1, 2005?

Which day of the week a date is/was

1. Go to the calendar creation page (new window).
2. Enter the year.
3. Select a country or leave as it is.
4. Create the calendar.
5. A calendar for the year you chose will be displayed. 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
• Birthday calculator – Find when you are 1 billion seconds old

Related links

• Calendar for 2009
• Calendar Generator – Create a calendar for any year
• The World Clock – Current time all over the world
• Countdown to New Year