Python实现日期判断和加减操作详解

python实现日期判断和加减操作

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#时间相关
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def if_workday(day_str, separator=""):
   """
   if a day is workday

:param day_str: string of a day
   :param separator: separator of year, month and day, default is empty
   :return: True: is workday; False: not workday
   """
   spec = "％Y" + separator + "％m" + separator + "％d"
   day = datetime.strptime(day_str, spec).date()
   # Monday == 0 ... Sunday == 6
   if day.weekday() in [0, 1, 2, 3, 4]:
       return True
   else:
       return False

def if_weekend(day_str, separator=""):
   """
   if a day is weekend

:param day_str: string of a day
   :param separator: separator of year, month and day, default is empty
   :return: True: is weekend; False: not weekend
   """
   spec = "％Y" + separator + "％m" + separator + "％d"
   day = datetime.strptime(day_str, spec).date()
   # Monday == 0 ... Sunday == 6
   if day.weekday() in [5, 6]:
       return True
   else:
       return False

def is_week_lastday():
   '''
   判断今天是否为周末，return the day of the week as an integer,Monday is 0 and Sunday is 6

:return:
   '''

now = (datetime.datetime.utcnow() + datetime.timedelta(hours=8))
   # 假如今天是周日
   todayIndex = now.weekday()
   # 如果今天是周日，则返回True
   if todayIndex == 6:
       print("todayIndex={},今天是周末...".format(todayIndex))
       return True
   else:
       print("todayIndex={},今天是周 {}，不是周末...".format(todayIndex,int(todayIndex+1)))
       return False

def is_week_whichday(dayIndex=6):
   '''
   判断今天一周的哪一天，周一为0，周末为6，return the day of the week as an integer,Monday is 0 and Sunday is 6

:return:
   '''

now = (datetime.datetime.utcnow() + datetime.timedelta(hours=8))
   # 假如今天是周日
   todayIndex = now.weekday()
   # 如果今天是周日，则返回True
   if todayIndex == dayIndex:
       print("todayIndex={},今天是周 {}，不是周 {}...".format(todayIndex, int(todayIndex+1),int(dayIndex+1)))
       return True
   else:
       print("todayIndex={},今天是周 {}，不是周 {}...".format(todayIndex,int(todayIndex+1),int(dayIndex+1)))
       return False

def is_month_lastday():
   '''
   # 判断今天是否为月末

:return:
   '''

# 获得当月1号的日期
   start_date = datetime.date.today().replace(day=1)
   # 获得当月一共有多少天（也就是最后一天的日期）
   _, days_in_month = calendar.monthrange(start_date.year, start_date.month)

todayIndex = time.strftime("％d", time.localtime())

# 如果今天是周末，返回True
   if int(todayIndex) == int(days_in_month):
       print("start_date={},todayIndex={},days_in_month={},今天是月末...".format(start_date,todayIndex, days_in_month))
       return True
   else:
       print("start_date={},todayIndex={},days_in_month={},今天不是月末...".format(start_date,todayIndex , days_in_month))
       return False

def get_this_week_start():
   '''
   获取本周第一天日期

:return:
   '''
   now = datetime.datetime.now()
   this_week_start = now - timedelta(days=now.weekday())
   this_week_end = now + timedelta(days=6 - now.weekday())
   print('--- this_week_start = {} this_week_end = {}'.format(this_week_start, this_week_end))
   print('--- this_week_start = {} '.format(this_week_start))
   return this_week_start

def get_this_week_end():
   '''
   # 获取本周最后一天日期

:return:
   '''

now = datetime.datetime.now()
   this_week_start = now - timedelta(days=now.weekday())
   this_week_end = now + timedelta(days=6 - now.weekday())
   print('--- this_week_start = {} this_week_end = {}'.format(this_week_start, this_week_end))
   print('--- this_week_end = {}'.format(this_week_end))
   return this_week_end

def get_last_month_start(now = datetime.datetime.now()):

now = datetime.datetime.strptime(now, "％Y-％m-％d")
   # 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) + datetime.timedelta(hours=23, minutes=59, seconds=59)
   # print('--- this_month_start = {} this_month_end = {}'.format(this_month_start, this_month_end))

# 上月第一天和最后一天
   last_month_end = this_month_start - timedelta(days=1)+ datetime.timedelta(hours=23, minutes=59, seconds=59)
   last_month_start = datetime.datetime(last_month_end.year, last_month_end.month, 1)
   # print('--- last_month_end = {} last_month_start = {}'.format(last_month_end, last_month_start))
   print('--- last_month_start = {}'.format(last_month_start))
   return last_month_start

def get_last_month_end(now = datetime.datetime.now()):
   now = datetime.datetime.strptime(now, "％Y-％m-％d")
   # 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) + datetime.timedelta(hours=23, minutes=59, seconds=59)
   # print('--- this_month_start = {} this_month_end = {}'.format(this_month_start, this_month_end))

# 上月第一天和最后一天
   last_month_end = this_month_start - timedelta(days=1) + datetime.timedelta(hours=23, minutes=59, seconds=59)
   last_month_start = datetime.datetime(last_month_end.year, last_month_end.month, 1)
   # print('--- last_month_end = {} last_month_start = {}'.format(last_month_end, last_month_start))
   print('--- last_month_end = {} '.format(last_month_end))
   return last_month_end

def get_this_month_start(now = datetime.datetime.now()):
   now = datetime.datetime.strptime(now, "％Y-％m-％d")
   # 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) + datetime.timedelta(hours=23, minutes=59, seconds=59)
   # print('--- this_month_start = {} this_month_end = {}'.format(this_month_start, this_month_end))

# 上月第一天和最后一天
   last_month_end = this_month_start - timedelta(days=1) + datetime.timedelta(hours=23, minutes=59, seconds=59)
   last_month_start = datetime.datetime(last_month_end.year, last_month_end.month, 1)
   # print('--- last_month_end = {} last_month_start = {}'.format(last_month_end, last_month_start))
   print('--- this_month_start = {} '.format(this_month_start))
   return this_month_start

def get_this_month_end(now = datetime.datetime.now()):
   now=datetime.datetime.strptime(now, "％Y-％m-％d")
   # 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) + datetime.timedelta(hours=23, minutes=59, seconds=59)

if now.month < 12:
       this_month_end = datetime.datetime(now.year, now.month + 1, 1) - timedelta(days=1) + datetime.timedelta(hours=23, minutes=59, seconds=59)
   elif  now.month >= 12:
       this_month_end = datetime.datetime(now.year, now.month , now.day+30) + datetime.timedelta(hours=23, minutes=59, seconds=59)

# print('--- this_month_start = {} this_month_end = {}'.format(this_month_start, this_month_end))

# 上月第一天和最后一天
   last_month_end = this_month_start - timedelta(days=1) + datetime.timedelta(hours=23, minutes=59, seconds=59)
   last_month_start = datetime.datetime(last_month_end.year, last_month_end.month, 1)
   # print('--- last_month_end = {} last_month_start = {}'.format(last_month_end, last_month_start))
   # print('--- this_month_end = {} '.format(this_month_end))
   return str(this_month_end)

#从一个时间段获取其中的每一天,可以自定义时间间隔
def get_every_day(start = '2018-01-01',end = '2021-01-01',daysCount=1):
   '''
   从一个时间段获取其中的每一天,可以自定义时间间隔

:param start: str类型，开始时间，如：'2018-01-01'
   :param end: str类型，结束时间，如：'2021-01-01'
   :param daysCount: int类型，每一个时间间隔，默认为1天
   :return:
   '''
   datestart = datetime.datetime.strptime(start, '％Y-％m-％d')
   dateend = datetime.datetime.strptime(end, '％Y-％m-％d')

date_list=[]
   while datestart < dateend:
       datestart += datetime.timedelta(days=daysCount)
       date_str=str(datestart.strftime('％Y-％m-％d'))
       # print('date_str={}'.format(date_str))
       date_list.append(date_str)

print('date_list={}'.format(date_list))
   return date_list

#从一个时间段获取其中的每一月,可以自定义时间间隔
def getBetweenEveryMonth(begin_date,end_date):
   date_list = []
   begin_date = datetime.datetime.strptime(begin_date, "％Y-％m-％d")
   end_date = datetime.datetime.strptime(end_date, "％Y-％m-％d")
   # end_date = datetime.datetime.strptime(time.strftime('％Y-％m-％d', time.localtime(time.time())), "％Y-％m-％d")
   while begin_date <= end_date:
       date_str = begin_date.strftime("％Y-％m-％d")
       begin_date = add_months_start(begin_date, 1)
       date_end=get_this_month_end(date_str)
       date_list.append((date_str+' 00:00:00',date_end))

print('date_list={}'.format(date_list))
   return date_list

def add_months_start(dt, months):
   month = int(dt.month - 1 + months)
   year = int(dt.year + month / 12)
   month = int(month ％ 12 + 1)
   day = min(dt.day, calendar.monthrange(year, month)[1])
   return dt.replace(year=year, month=month, day=day)

def add_months_end(dt, months):
   month = int(dt.month - 1 + months)
   year = int(dt.year + month / 12)
   month = int(month ％ 12 + 1)
   day = max(dt.day, calendar.monthrange(year, month)[1])
   return dt.replace(year=year, month=month, day=day)

来源：https://blog.csdn.net/zh6526157/article/details/122431151