The total number of days between Tuesday, September 21st, 1920 and Wednesday, August 8th, 2012 is 33,559 days.
This is equal to 91 years, 10 months, and 18 days.
This does not include the end date, so it's accurate if you're measuring your age in days, or the total days between the start and end date. But if you want the duration of an event that includes both the starting date and the ending date, then it would actually be 33,560 days.
If you're counting workdays or weekends, there are 23,971 weekdays and 9,588 weekend days.
If you include the end date of Aug 8, 2012 which is a Wednesday, then there would be 23,972 weekdays and 9,588 weekend days including both the starting Tuesday and the ending Wednesday.
33,559 days is equal to 4,794 weeks and 1 day.
The total time span from 1920-09-21 to 2012-08-08 is 805,416 hours.
This is equivalent to 48,324,960 minutes.
You can also convert 33,559 days to 2,899,497,600 seconds.
September 21st, 1920 is a Tuesday. It is the 265th day of the year, and in the 39th week of the year (assuming each week starts on a Monday), or the 3rd quarter of the year. There are 30 days in this month. 1920 is a leap year, so there are 366 days in this year. The short form for this date used in the United States is 9/21/1920, and almost everywhere else in the world it's 21/9/1920.
August 8th, 2012 is a Wednesday. It is the 221st day of the year, and in the 32nd week of the year (assuming each week starts on a Monday), or the 3rd quarter of the year. There are 31 days in this month. 2012 is a leap year, so there are 366 days in this year. The short form for this date is 8/8/2012.
This site provides an online date calculator to help you find the difference in the number of days between any two calendar dates. Simply enter the start and end date to calculate the duration of any event. You can also use this tool to determine how many days have passed since your birthday, or measure the amount of time until your baby's due date. The calculations use the Gregorian calendar, which was created in 1582 and later adopted in 1752 by Britain and the eastern part of what is now the United States. For best results, use dates after 1752 or verify any data if you are doing genealogy research. Historical calendars have many variations, including the ancient Roman calendar and the Julian calendar. Leap years are used to match the calendar year with the astronomical year. If you're trying to figure out the date that occurs in X days from today, switch to the Days From Now calculator instead.