def get_next_fire_time(self, start_date):
if start_date < self.start_date:
return self.start_date
timediff_seconds = timedelta_seconds(start_date - self.start_date)
next_interval_num = int(ceil(timediff_seconds / self.interval_length))
return self.start_date + self.interval * next_interval_num
def __init__(self, interval, start_date=None):
if not isinstance(interval, timedelta):
raise TypeError('interval must be a timedelta')
if start_date:
start_date = convert_to_datetime(start_date)
self.interval = interval
self.interval_length = timedelta_seconds(self.interval)
if self.interval_length == 0:
self.interval = timedelta(seconds=1)
self.interval_length = 1
if start_date is None:
self.start_date = datetime.now() + self.interval
else:
self.start_date = convert_to_datetime(start_date)