def get_local_next_event_due_timestamp_for_monthly_schedule(self, instance):
target_date = None
while target_date is None:
current_event = self.memoized_events[instance.current_event_num]
if current_event.day < -28 or current_event.day == 0 or current_event.day > 31:
# Negative days are days from the end of the month, with -1
# being the last day of the month. We don't allow this going
# past -28 since it's not very useful to do so, and imposing
# this restriction lets us make the assumption that we can
# always schedule a negative day.
raise InvalidMonthlyScheduleConfiguration("Day must be between -28 and 31, and not be 0")
year_offset = (instance.schedule_iteration_num - 1) / 12
month_offset = (instance.schedule_iteration_num - 1) % 12
year = instance.start_date.year + year_offset
month = instance.start_date.month + month_offset
days_in_month = calendar.monthrange(year, month)[1]
if current_event.day > 0:
if current_event.day > days_in_month:
# If the day refers to a date that is not possible to schedule
# (for example, February 30th), just move to the next month.
instance.schedule_iteration_num += 1
instance.current_event_num = 0
continue
target_date = date(year, month, current_event.day)
else:
# It's a negative day, which counts back from the last day of the month
target_date = date(year, month, days_in_month + current_event.day + 1)
return datetime.combine(target_date, current_event.time)
def get_local_next_event_due_timestamp_for_monthly_schedule(
self, instance):
if self.repeat_every >= 0:
raise ValueError(
"Expected negative value for repeat_every in a monthly schedule"
)
target_date = None
start_date_with_offset = instance.start_date + timedelta(
days=self.start_offset)
while target_date is None:
current_event = self.memoized_events[instance.current_event_num]
if current_event.day < -28 or current_event.day == 0 or current_event.day > 31:
# Negative days are days from the end of the month, with -1
# being the last day of the month. We don't allow this going
# past -28 since it's not very useful to do so, and imposing
# this restriction lets us make the assumption that we can
# always schedule a negative day.
raise InvalidMonthlyScheduleConfiguration(
"Day must be between -28 and 31, and not be 0")
months_since_start_date = (instance.schedule_iteration_num -
1) * (-1 * self.repeat_every)
year = start_date_with_offset.year
month = start_date_with_offset.month + months_since_start_date
while month > 12:
year += 1
month -= 12
days_in_month = calendar.monthrange(year, month)[1]
if current_event.day > 0:
if current_event.day > days_in_month:
# If the day refers to a date that is not possible to schedule
# (for example, February 30th), just move to the next month.
instance.schedule_iteration_num += 1
instance.current_event_num = 0
continue
target_date = date(year, month, current_event.day)
else:
# It's a negative day, which counts back from the last day of the month
target_date = date(year, month,
days_in_month + current_event.day + 1)
local_time, additional_day_offset = current_event.get_time(
case=self.get_case_or_none(instance))
return datetime.combine(
target_date + timedelta(days=additional_day_offset), local_time)