Five months before February 1st would be September 1st. To calculate this, you start from February and count backward five months: January, December, November, October, and September. Therefore, September 1st is the date that is five months before February 1st.
Five months before the first of February is the first of September of the previous year. This is because counting back five months from February takes you through January, December, November, October, and finally September.
Nine months after February 9th would be November 9th.
Six months before March 1, 2000, was September 1, 1999. To find this date, you simply count back six months from March, which takes you through February, January, December, November, October, and finally to September.
24 February
In 2016 it will be 29th February. However, in non leap years it will be the 28th February.
11 February
Nine months before October 3 is January 3 of the same year. To find this, you subtract nine months from October, which takes you back through the months of September, August, July, June, May, April, March, February, and January. Therefore, the date is January 3.
Three months from November 3rd is February 3rd of the following year.
10 August 2014
February 2 2011
In any given year, the date 100 days before February 1 is October 24 of the previous year.
As of the 23rd of October 2017, it would be the 23rd of February, 2101.