import datetime

from datetime import timedelta

now = datetime.datetime.now()

#今天

today = now

#昨天

yesterday = now - timedelta(days=1)

#明天

tomorrow = now + timedelta(days=1)
#當前季度

now_quarter = now.month / 3 if now.month % 3 == 0 else now.month / 3 + 1

#本周第一天和最后一天

this_week_start = now - timedelta(days=now.weekday())

this_week_end = now + timedelta(days=6-now.weekday())

#上周第一天和最后一天

last_week_start = now - timedelta(days=now.weekday()+7)

last_week_end = now - timedelta(days=now.weekday()+1)

#本月第一天和最后一天

this_month_start = datetime.datetime(now.year, now.month, 1)

this_month_end = datetime.datetime(now.year, now.month + 1, 1) - timedelta(days=1)

#上月第一天和最后一天

last_month_end = this_month_start - timedelta(days=1)

last_month_start = datetime.datetime(last_month_end.year, last_month_end.month, 1)

#本季第一天和最后一天

month = (now.month - 1) - (now.month - 1) % 3 + 1

this_quarter_start = datetime.datetime(now.year, month, 1)

this_quarter_end = datetime.datetime(now.year, month + 3, 1) - timedelta(days=1)

#上季第一天和最后一天

last_quarter_end = this_quarter_start - timedelta(days=1)

last_quarter_start = datetime.datetime(last_quarter_end.year, last_quarter_end.month - 2, 1)

#本年第一天和最后一天

this_year_start = datetime.datetime(now.year, 1, 1)

this_year_end = datetime.datetime(now.year + 1, 1, 1) - timedelta(days=1)

#去年第一天和最后一天

last_year_end = this_year_start - timedelta(days=1)

last_year_start = datetime.datetime(last_year_end.year, 1, 1)

總結

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