New years
The first day of the week is Sunday.
The first day of Autumn/Fall is called the autumnal equinox.
Sunday is the first day of the week but Monday is the first day of the work and school week.
The date of Easter is determined by the first day of spring. Easter is held on the first Sunday after the first full moon after the first day of spring.
The first day of spring.
the first day of the year is 31/12/11
the first day after the last day of the previous year.
June 21st, 2011... first day of summer. June 20th, 2012... first day of summer. June 21st, 2013... first day of summer. June 20th, 2014... first day of summer. June 21st, 2015... first day of summer.
the first flag day was in 1701
The first day of 2011 is Saturday
The 1st of January 1AD.
Wednesday, January 1st, 1969 was the first day of the year.