every day vs everyday

  Every day - here every is a determiner and day is a noun.

  When you say every day you mean each day without exception.

  For example: You have been late for school every day this week.

  Everyday is an adjective.

  When you say everyday you mean ordinary, unremarkable.

  For example: My culture pages offer an insight into the everyday life of Britain.

  !Note - if you want to check yourself see if you could write "every morning" or "every evening" without loss of meaning. Then you'll know it should be "every day".

  I am reliably informed that in the US people happily use everyday for every situation.

  - See more at: http://www.learnenglish.de/mistakes/everyday.html\#sthash.8E4gtEZl.dpuf