12
84.
February 18th 1980 can also be written as 02-18-1980 and in Roman numerals this would be II.XVIII.MCMLXXX
From July 18th, there are approximately six weeks until September. From the first of the year, there is thirty four weeks until the month of September begins.
The given date was a Saturday.
12
On February 18th
18th, February, 1973, was a Sunday.
84.
a lot
That is just the way the days work out. There is no particular reason. All 3 years are leap years, so they would have the same dates. If we take a random date, the 18th of April, and follow its days of the week from 2004 to 2020, you can see the natural flow of dates and where the leap years cause an extra day to be skipped: Sunday the 18th of April 2004 (leap year) Monday the 18th of April 2005 Tuesday the 18th of April 2006 Wednesday the 18th of April 2007 Friday the 18th of April 2008 (leap year) Saturday the 18th of April 2009 Sunday the 18th of April 2010 Monday the 18th of April 2011 Wednesday the 18th of April 2012 (leap year) Thursday the 18th of April 2013 Friday the 18th of April 2014 Saturday the 18th of April 2015 Monday the 18th of April 2016 (leap year) Tuesday the 18th of April 2017 Wednesday the 18th of April 2018 Thursday the 18th of April 2019 Saturday the 18th of April 2020 (leap year)
February 18th 1967 was a Saturday.
February 18th, 1993 fell on a Thursday.
April 18th, 1958 fell on a Friday.
18th April 1950 was a Tuesday.
18th April 1955 was a Monday.
There were many things that happened on February 18th in history that is noteworthy. The list includes the first opera performed in America in 1735, the first steamboat to California began trips in 1849, and in 1908 postage stamps came in rolls.