# -*- coding:utf-8 -*-
# @author Yue Bin ( hi.moonlight@gmail.com )
# @date 2017-06-07
import time
import datetime
from dateutil.parser import parse
[docs]def datediff(dt, base = None, unit = 'day'):
"""
用来计算分两个datetime的相差天数或者分钟数。
如果不显示的指定base，则计算与当前时间的diff
:param dt: input date
:param base: 基准日期
:param unit: 计算粒度,可选的有 ``day``, ``hour`` , ``minute`` , ``second``
"""
if not base:
base = datetime.datetime.now()
delta = base - dt
if unit == "day":
diff = delta.days
elif unit == "hour":
diff = delta.seconds//3600
elif unit == "minute":
diff = (delta.seconds//60)%60
elif unit == "second":
diff = delta.seconds
else:
diff = None
return diff
[docs]def gen_date_list_by_days(begin = None, days=7, join = False, exclude = []):
"""
生成指定的时间list
:param begin: 起始日期，默认要求datetime类型，如果是str会自动尝试解析成datetime
:param days: 生成距离begin的最近几天
:param join: 是否将list按照,拼接。hadoop的input目录常用
:param exclude: 去除日期。 统计数据时常用，统计最近7天，不过某几天数据损坏需要去掉某几天。
>>> gen_date_list_by_days(begin ='20170620', days=3) # 今天2017-6-24
['20170619', '20170618', '20170617']
>>> gen_date_list_by_days(begin ='20170620', days=3, exclude=['20170618']) # 今天2017-6-24
['20170619', '20170617']
>>> gen_date_list_by_days(days=3) # 今天2017-6-24
['20170623', '20170622', '20170621']
>>> gen_date_list_by_days(days=3, join = True) # 今天2017-6-24
'20170623,20170622,20170621'
"""
if not begin:
begin = gen_today(delta=0, raw = True)
if type(begin) != datetime.datetime:
begin = parse(begin)
ret = []
for i in range(days):
dt = begin - datetime.timedelta(i+1)
dt = dt.strftime('%Y%m%d')
if dt in exclude:
continue
ret.append(dt)
if join:
ret = ",".join(ret)
return ret
[docs]def gen_date_list(begin, end, join = False, exclude = [], exclude_today = True):
"""
生成指定起始到结束之内的日期列表，注意同gen_date_list_by_days对比。
"""
if end == None:
end = datetime.datetime.now()
if type(begin) != datetime.datetime:
begin = parse(begin)
if type(end) != datetime.datetime:
end = parse(end)
if begin > end:
return []
dt_exclude = []
if exclude_today:
dt_exclude.append(parse(datetime.datetime.now().strftime('%Y%m%d')))
for day in exclude:
if type(day) != datetime.datetime:
day = parse(day)
dt_exclude.append(day)
ret = []
while begin <= end:
if begin in dt_exclude:
begin = begin + datetime.timedelta(days=(1))
continue
dt = begin.strftime('%Y%m%d')
ret.append(dt)
begin = begin + datetime.timedelta(days=(1))
if join:
return ",".join(ret)
return ret
[docs]def gen_latest_date_list(begin, end, join = False, exclude = []):
"""
已废弃，请用gen_date_list
"""
ret = []
for i in range(begin+1, end):
dt = datetime.datetime.now() - datetime.timedelta(days=(i))
dt = dt.strftime('%Y%m%d')
if dt in exclude:
continue
ret.append(dt)
if join:
return ",".join(ret)
return ret
[docs]def datetime2timestamp(date):
"""
datetime格式转时间戳(int)
"""
return int(time.mktime(date.timetuple()))
[docs]def str2date(date):
"""
str解析成datetime, 会尝试各种格式解析
>>> str2date('20170101')
<type 'datetime.datetime'>
>>> str2date('2017-01-01')
<type 'datetime.datetime'>
>>> str2date('2017-01-01 11:11:22')
<type 'datetime.datetime'>
"""
return parse(date)
[docs]def str2datetime(date, date_format='%Y-%m-%d %H:%M:%S'):
"""
固定格式的str转datetime
"""
return datetime.datetime.strptime(date, date_format)
[docs]def timestamp2datetime(timestamp):
"""
时间戳转datetime
:param timestamp: str or int or float
:returns: 返回datetime
"""
if type(timestamp) == str:
timestamp = int(float(timestamp))
x = time.localtime(timestamp)
return str2date(time.strftime('%Y-%m-%d %H:%M:%S',x))
[docs]def gen_today(delta = 1, raw = False, short = True, with_time = False, only_time = False):
"""
生成当天的日期
:param delta: 时间偏移量
:param raw: 如果设置为``True``,返回``datetime``类型, 否则返回``str``类型
:param short: 若为True, 会返回精简时间，如20170101，否则返回2017-01-01
:param with_time: 是否添加时间，否则只返回日期
:param only_time: 是否只返回时间，不加日期
>>> gen_today(delta=0, with_time=True)
20170624145222
>>> gen_today(delta=0, with_time=True, short=False)
2017-06-24 15:06:12
>>> gen_today(delta=0, only_time=True, short=False)
15:06:12
>>> gen_today(delta=0, only_time=True)
150612
>>> gen_today(delta=0, with_time=False)
20170624
>>> gen_today(delta=1, with_time=False)
20170623
"""
dt = datetime.datetime.now()-datetime.timedelta(delta)
if raw:
return dt
if short:
if only_time:
str_dt = dt.strftime('%H%M%S')
else:
if not with_time:
str_dt = dt.strftime('%Y%m%d')
else:
str_dt = dt.strftime('%Y%m%d%H%M%S')
else:
if only_time:
str_dt = dt.strftime('%H:%M:%S')
else:
if not with_time:
str_dt = dt.strftime('%Y-%m-%d')
else:
str_dt = dt.strftime('%Y-%m-%d %H:%M:%S')
return str_dt
if __name__ == "__main__":
#print gen_date_list(0, 4)
#print gen_date_list(0, 4, join=True)
#print datetime2timestamp(datetime.datetime.now())
#print str2datetime('2017-04-03 01:11:11')
#print timestamp2datetime(1496820643)
#print gen_date_list_by_days(begin ='20170620', days=3, exclude=['20170618'])
#print type(str2date('20170101'))
#print gen_today(delta=0,with_time=True,short=False)
print gen_today(only_time=True)
#print gen_today(delta=0, only_time=True, with_time=True)
print gen_date_list(begin='20170301',end='20170303', exclude=['20170204'])
print gen_date_list(begin='20170301',end=None, exclude=['20170204'],exclude_today=False)