@spec days_from_now(integer(), non_neg_integer()) :: t()

Creates a new :Validity record with an notAfter value a given number of days in the future. The notBefore value can be backdated (by default 300 seconds) to avoid newly issued certificates from being rejected by peers due to poorly synchronized clocks.

For CA certificates, consider using new/2 instead, with a not_before value that does not reveal the exact time when the key pair was generated. This minimizes information leakage about the state of the RNG.

@spec new(DateTime.t(), DateTime.t()) :: t()

Creates a new :Validity record with the given start and end timestamps in DateTime format.

examples

Examples:

iex> {:ok, not_before, 0} = DateTime.from_iso8601("2018-01-01T00:00:00Z")
iex> {:ok, not_after, 0} = DateTime.from_iso8601("2018-12-31T23:59:59Z")
iex> X509.Certificate.Validity.new(not_before, not_after)
{:Validity, {:utcTime, '180101000000Z'}, {:utcTime, '181231235959Z'}}

iex> {:ok, not_before, 0} = DateTime.from_iso8601("2051-01-01T00:00:00Z")
iex> {:ok, not_after, 0} = DateTime.from_iso8601("2051-12-31T23:59:59Z")
iex> X509.Certificate.Validity.new(not_before, not_after)
{:Validity, {:generalTime, '20510101000000Z'},
  {:generalTime, '20511231235959Z'}}