class Rufus::Scheduler

def self.parse_to_time(o)
  t = o
  t = parse(t) if t.is_a?(String)
  t = Time.now + t if t.is_a?(Numeric)
  raise ArgumentError.new(
    "cannot turn #{o.inspect} to a point in time, doesn't make sense"
  ) unless t.is_a?(Time)
  t
end