It is a century or a centennial
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Centenary means the 100th anniversay, which would be the 100th year.
A 100th wedding anniversary is called a "diamond" anniversary.
April 10th in a normal year or April 9th if it is a leap year.
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.
April 10th is the 100th day of the year.