The total number of days between Wednesday, May 15th, 1918 and Saturday, April 18th, 1931 is 4,721 days.
This is equal to 12 years, 11 months, and 3 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 4,722 days.
If you're counting workdays or weekends, there are 3,373 weekdays and 1,348 weekend days.
If you include the end date of Apr 18, 1931 which is a Saturday, then there would be 3,373 weekdays and 1,349 weekend days including both the starting Wednesday and the ending Saturday.
4,721 days is equal to 674 weeks and 3 days.
The total time span from 1918-05-15 to 1931-04-18 is 113,304 hours.
This is equivalent to 6,798,240 minutes.
You can also convert 4,721 days to 407,894,400 seconds.
May 15th, 1918 is a Wednesday. It is the 135th day of the year, and in the 20th week of the year (assuming each week starts on a Monday), or the 2nd quarter of the year. There are 31 days in this month. 1918 is not a leap year, so there are 365 days in this year. The short form for this date used in the United States is 5/15/1918, and almost everywhere else in the world it's 15/5/1918.
April 18th, 1931 is a Saturday. It is the 108th day of the year, and in the 16th week of the year (assuming each week starts on a Monday), or the 2nd quarter of the year. There are 30 days in this month. 1931 is not a leap year, so there are 365 days in this year. The short form for this date used in the United States is 4/18/1931, and almost everywhere else in the world it's 18/4/1931.
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.