Syntax:
NOW()

Returns the current date and time as a value in 'YYYY-MM-DD HH:MM:SS'
or YYYYMMDDHHMMSS.uuuuuu format, depending on whether the function is
used in a string or numeric context. The value is expressed in the
current time zone.

URL: http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html

