def from_cron(start_time, *expression_parts)
      expression = ::IceCubeCron::ExpressionParser.new(*expression_parts)
      rule = ::IceCubeCron::RuleBuilder.new.build_rule(expression)

      schedule = ::IceCube::Schedule.new(::IceCubeCron::Util.sanitize_date_param(start_time))
      schedule.add_recurrence_rule(rule)

      schedule
    end
def from_cron(start_time, *expression_parts)
      expression = ::IceCubeCron::ExpressionParser.new(*expression_parts)
      rule = ::IceCubeCron::RuleBuilder.new.build_rule(expression)

      schedule = ::IceCube::Schedule.new(::IceCubeCron::Util.sanitize_date_param(start_time))
      schedule.add_recurrence_rule(rule)

      schedule
    end
Generates an ::IceCube::Schedule from a cron expression_parts

 :args: start_time, expression_parts

 ## Examples

 ```ruby
 schedule = ::IceCube::Schedule.from_cron(::Date.current, "* * * * 5")

 schedule = ::IceCube::Schedule.from_cron(::Date.new(2015, 1, 5), :repeat_day => 5)

 schedule.occurrences_between(::Date.new(2015, 3, 5), ::Date.new(2015, 6, 5))
 # => [2015-03-05 00:00:00 UTC, 2015-04-05 00:00:00 UTC, 2015-05-05 00:00:00 UTC, 2015-06-05 00:00:00 UTC]