[Answered ]-Calculate the number of deltas between two dates

Let me know if this helps

    #calculate delta between two dates
    def delta_days(start_date, end_date):
        start = datetime.strptime(start_date, "%m/%d/%Y")
        end = datetime.strptime(end_date, "%m/%d/%Y")
        delta = end - start
        return delta.days

I’ve used this solution for now. It doesn’t feel very clean but it works.

        start_date = self.cleaned_data['from_date']
        iterations = 0
        while start_date < self.cleaned_data['to_date']:
            iterations += 1
            start_date += relativedelta(days=self.cleaned_data['delta_days'], weeks=self.cleaned_data['delta_weeks'], months=self.cleaned_data['delta_months'])
        if iterations > 36: raise ValidationError('The selected date range and deltas result in too many dates to calculate. Please reduce scope to 36 or less dates.')

try this one. First you have to convert date difference and relative delta to days (integer) to perform the arithmetic you needed

delta=relativedelta(days= self.cleaned_data['delta_days'], months=self.cleaned_data['delta_months'])
no_loops = (self.cleaned_data['to_date'] - self.cleaned_data['from_date']).days / delta.days
if no_loops > 36: raise ValidationError('Too many iterations.')