The 100th day of the year falls on April 10th in a standard year and April 9th in a leap year. This calculation is based on the Gregorian calendar, which has 365 days in a common year and 366 days in a leap year. January has 31 days, February has 28 days (29 in a leap year), March has 31 days, and April has 9 days to reach the 100th day of the year.
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April 10th is the 100th day of this year (2009). During leap years, however, the 100th day of those years will occur on April 9th. This type of information is obtained by consulting a Julian calendar - a calendar that shows, besides normal information, the number of days which have elapsed (and usually also how many are remaining) in the current year.
April 10th is the 100th day of the year.
The thirtieth and thirty-first day of that month -- every leap year they have the twenty-ninth day.
April 10th in a normal year or April 9th if it is a leap year.
day, month and year