Interval type for Ecto, currently only implemented for PostgreSQL, PR's to support others are welcome.

If available in Hex, the package can be installed by adding ecto_interval to your list of dependencies in mix.exs:

def deps do
  [{:ecto_interval, "~> 0.1.0"}]
end

Just use EctoInterval as a field type, like:

    field :renewal_period, EctoInterval, default: %{months: 0, days: 0, secs: 0}