May 18 to July 4 of the same year is 47 days.
The total number of days between Friday, May 18th, 2012 and Wednesday, July 4th, 2012 is 47 days.
The total number of days between Wednesday, May 9th, 2012 and Wednesday, July 18th, 2012 is 70 days. This is equal to exactly 2 months and 9 days.
Including the start and end dates in the calculation, there are 51 days between the two dates.
July 18, 2008 + 719 days = July 7, 2010.
51
Subtracting 1000 days from July 18, 2014 gives October 22, 2011.
Adding 180 days to July 18, 2011 gives January 14, 2012.
18 days from May 15.
The actual bombardment of Fort Sumter lasted over the days of April 12, 13, and 14, 1861.
The battle fought on 1 July - 18 November 1916. It lasted for 140 days.
In a normal year, adding 180 days to January 18 gives July 17 of the same year. Adding 180 days to January 18 in a leap year gives July 16.
The battle occured on May 18 - July 4, 1863. So it lasted 16 days or 2 weeks and 2 days.