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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 below.

Calculate an event's duration

The following steps will help you find out how many days an event lasted or is going to last (via counting the start and end dates):

  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)?

The following steps will help you to find out how many days, months and years someone is (based on a birth date):

  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?

If you know the time of day you were born, the time duration calculator (new window) can give even more accurate results with regard to hours, minutes and seconds.

Calculate your age by approximate hours, minutes and seconds

Follow these steps if you want to find out your age by seconds, minutes, hours, days, and weeks (calculations are rounded off):

  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

This tool is useful for genealogists, as the birth date is not always recorded on death certificates, the tombstone or grave, even if the age and death date is known. Follow these steps:

  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

This calculator allows people to calculate what date it will be in a number of days after a particular date, which is a useful for calculating the timing involved in contracts or planning various events. Follow these steps:

  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

Follow these steps to find which day of week a date is (eg. a birth date):

  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.
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