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)

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