django如何计算日期

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import datetime,timedelta
import calendar

now = datetime.now()
today = datetime.now().date()

# 今日if days == "1":
    quesryset = DailyReport.objects.filter(createdate__gte=str(today) + ' 00:00:00')# 昨天elif days == "2":
    end = (now + timedelta(days=-1)).date()
    quesryset = DailyReport.objects.filter(createdate__gte=str(end) + ' 00:00:00', createdate__lte=str(end) + ' 23:59:59')# 本周elif days == "3":
    end = (now + timedelta(days=-now.isoweekday())).date()
    quesryset = DailyReport.objects.filter(createdate__gte=str(end) + ' 00:00:00', createdate__lte=str(today) + ' 23:59:59')# 上周elif days == "4":
    end = (now - timedelta(days=7 + now.isoweekday())).date()
    today = (now - timedelta(days=now.isoweekday()+1)).date()
    quesryset = DailyReport.objects.filter(createdate__gte=str(end) + ' 00:00:00', createdate__lte=str(today) + ' 23:59:59')# 本月elif days == "5":
    end = (now - timedelta(days=now.day)).date()
    quesryset = DailyReport.objects.filter(createdate__gte=str(end) + ' 00:00:00', createdate__lte=str(today) + ' 23:59:59')# 上月elif days == "6":
    last_month = now - timedelta(days=now.day)
    end_month_days = calendar.monthrange(last_month.year, last_month.month)[1]
    end = (last_month - timedelta(days=end_month_days)).date()
    today = (now - timedelta(days=now.day+1)).date()
    quesryset = DailyReport.objects.filter(createdate__gte=str(end) + ' 00:00:00', createdate__lte=str(today) + ' 23:59:59')# 过去七天elif days == "7":
    end = (now - timedelta(days=7)).date()
    quesryset = DailyReport.objects.filter(createdate__gte=str(end) + ' 00:00:00', createdate__lte=str(today) + ' 23:59:59')# 过去30天elif days == "8":
    end = (now - timedelta(days=30)).date()
    quesryset = DailyReport.objects.filter(createdate__gte=str(end) + ' 00:00:00', createdate__lte=str(today) + ' 23:59:59')

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