seconds_since_midnight

Returns the number of seconds since 00:00:00.

Time.new(2012, 8, 29,  0,  0,  0).seconds_since_midnight # => 0.0
Time.new(2012, 8, 29, 12, 34, 56).seconds_since_midnight # => 45296.0
Time.new(2012, 8, 29, 23, 59, 59).seconds_since_midnight # => 86399.0