Python3 常用日期计算方法

import math
from datetime import datetime, timedelta, date
import calendar
def get_today_zero_time():

"""

获取当前零点时间

"""

time_now = datetime.now()

zero_time = time_now - timedelta(hours=time_now.hour) - timedelta(minutes=time_now.minute) - timedelta(

seconds=time_now.second) - timedelta(microseconds=time_now.microsecond)

return zero_time
def get_current_hour():

"""

获取当前整点时间

"""

time_now = datetime.now()

time_now_hour = time_now - timedelta(minutes=time_now.minute) - timedelta(seconds=time_now.second) - timedelta(

microseconds=time_now.microsecond)

return time_now_hour
def get_last_five_minutes_time():

"""

获取上一个整五分钟时间

"""

time_now = datetime.now()

mins = math.floor(time_now.minute /5) *5

time_now_hour = time_now - timedelta(minutes=time_now.minute) - timedelta(seconds=time_now.second) - timedelta(

microseconds=time_now.microsecond) + timedelta(minutes=mins)

return time_now_hour
def get_month_start_time():

now = datetime.now().date()

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

this_month_end = datetime(now.year, now.month, calendar.monthrange(now.year, now.month)[1])

return this_month_start
def get_month_first_and_last_day(year, month):

# 获取当前月的第一天的星期和当月总天数

weekDay, monthCountDay = calendar.monthrange(year, month)

# 获取当前月份第一天

firstDay = date(year, month, day=1)

# 获取当前月份最后一天

lastDay = date(year, month, day=monthCountDay)

# 返回第一天和最后一天

return firstDay, lastDay
def get_past_month_first_and_last_day():

if  date.today().month ==1:

lastMonthFirstDay = date(date.today().year-1, 12, 1)

else:

lastMonthFirstDay = date(date.today().year, date.today().month - 1, 1)

lastMonthLastDay = date(date.today().year, date.today().month, 1) - timedelta(1)

return lastMonthFirstDay, lastMonthLastDay
def get_year_first_and_last_day(now_time):

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

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

return this_year_start, this_year_end
def get_this_week_start_and_end_day():

today = date.today()

return  today - timedelta(days=today.weekday())
def get_past_week_start_and_end_day():

today = date.today()

# threeWeeksAgo_start = today - timedelta(days=today.weekday() + 21)

# threeWeeksAgo_end = today - timedelta(days=today.weekday() + 15)

# twoWeeksAgo_start = today - timedelta(days=today.weekday() + 14)

# twoWeeksAgo_end = today - timedelta(days=today.weekday() + 8)

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

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

return last_week_start, last_week_end
def get_week_start_and_end_day_at_date(q_date):

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

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

return last_week_start, last_week_end
if name == "main":

print(get_last_five_minutes_time())

print(get_month_start_time())

print(get_today_zero_time() - get_month_start_time())

print(get_month_first_and_last_day(get_today_zero_time().year, get_month_start_time().month))

print(get_past_month_first_and_last_day())

print(get_past_week_start_and_end_day())