tai64.rb

tai64.rb

# tai64.rb
# http://cr.yp.to/libtai/tai64.html
class Time
  TAI64_REGEX = Regexp.new(/(?:^\@)?([0-9a-fA-F]{16})/)
  TAI64N_REGEX = Regexp.new(/#{TAI64_REGEX}([0-9a-fA-F]{8})/)

  def self.tai64(str, leapseconds=10)
    if match = TAI64N_REGEX.match(str).to_a.values_at(1)
      tai64 = match[0].hex - 2**62 - leapseconds
      return Time.at(tai64)
    end
    raise ArgumentError, "not TAI64 compliant date: #{str}"
  end

  def self.tai64n(str, leapseconds=10)
    if match = TAI64N_REGEX.match(str).to_a.values_at(1,2)
      tai64 = match[0].hex - 2**62 - leapseconds
      nano = match[1].hex / 10**3
      return Time.at(tai64,nano)
    end
    raise ArgumentError, "not TAI64N compliant date: #{str}"
  end

  def tai64(leapseconds=10)
    return sprintf("%016x", 2**62 + self.to_i + leapseconds)
  end

  def tai64n(leapseconds=10,nanosec=500)
    return sprintf("%016x%08x", 2**62 + self.to_i + leapseconds, self.usec * 10**3 + nanosec)
  end
end