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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

To find how many days something lasted or is going to last, where all the dates from the first to the last should be counted, follow these steps:
  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)?

To find how many days, months and years someone are, based on the birth date, follow these steps:
  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?

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

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

Follow these steps, for lots of good opportunities to celebrate:
  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

This is useful for genealogists, as the birth date is not always recorded on death certificates, the tombstone or grave, while 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 "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

To calculate which date it will be in a number of days after a date, which is a common calculation in contracts or planning purposes. 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 "Calculate new date!"

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

Which day of week a date is/was

To find which day of week a date is (e.g. the birth date); the calendar can be used:
  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
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