fix #1284, fix #1313 -- fix dates in new_post

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
While we’re at it, change documentation and sample site to reflect new date format

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
remove unused import

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
hardcode the new date format in a test

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
Merge pull request #1314 from getnikola/fix-dates

fix #1284, fix #1313 -- fix dates in new_post