April
April.Jan: 1- 31Feb: 31-59 or 60March: 90 or 91April: 121 or 122
In regular years, the 100th day of the year is the 10th of April. In leap years, it's the 9th of April.
December Some regions begin school in early to mid August (this gives them extra days to buffer against days off for heavy snow fall), for them day 100 may be in late November. However for most schools starting in late August or early September, the 100th day of the school year will fall somewhere in December.
Pope Valentine (Valentinus) was the 100th pope and ruled for one month in the year 827.
In the year 2016, the month of Abib fell in the month of April.
In the year 2016, the month of Nisan fell in the month of April.
Centenary means the 100th anniversay, which would be the 100th year.
September
During a year that is not a leap year it is April 10. For leap years it is April 9.
During a year that is not a leap year it is April 10. For leap years it is April 9.
A 100th year Anniversary is CAlled a Cenntenial .
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.