python处理时间和日期

时间和日期

 （图中错误修正：dt_obj.strftime(format)）

 

 

import time, datetime

1. datetime obj

1) datetime

datetime.datetime.now()

datetime.datetime.now() - datetime.timedelta(days=42)

datetime.datetime.combine(datetime.date.today(), datetime.time.min)

datetime.datetime(*time.localtime()[0:6])

datetime.datetime.strptime("2016-05-04 00:00:00", "%Y-%m-%d %H:%M:%S")

datetime.datetime.fromtimestamp(1462291200.0)

datetime.datetime.fromtimestamp(time.mktime(time.gmtime())) == datetime.datetime.utcfromtimestamp(time.mktime(time.localtime()))

2) date

datetime.datetime.now().date()

datetime.date.today()

datetime.date.today() + datetime.timedelta(days=42)

3) timedelta

datetime.timedelta(days=42)

# datetime.timedelta(days=42).total_seconds()

(datetime.datetime.now() - datetime.datetime(2016,5,4,0,0,0))

# (datetime.datetime.now() - datetime.datetime(2016,5,4,0,0,0)).total_seconds()

2. time tuple

time.localtime()

time.gmtime()

datetime.datetime.now().timetuple()

time.strptime("2016-05-04 00:00:00", "%Y-%m-%d %H:%M:%S")

time.localtime(1462291200.0)

3. string

datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")

time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())

4. time stamp

time.time()

time.mktime(time.localtime())

time.mktime(time.gmtime())

int(time.time()) + 86400 * days

- 迭代：

import datetime

begin, end = ‘20151101’, datetime.datetime.today().strftime("%Y%m%d")

begin_tuple, end_tuple = datetime.datetime.strptime(begin, "%Y%m%d”), datetime.datetime.strptime(end, "%Y%m%d”)

 

mid_tuple = begin_tuple

while mid_tuple < end_tuple:

mid = mid_tuple.strftime("%Y%m%d")

print mid

mid_tuple += datetime.timedelta(days=30)

- dateutil库：

import datetime

from dateutil.rrule import rrule, MONTHLY

begin_day = datetime.datetime.strptime("2015-11-01", "%Y-%m-%d")

end_day = (datetime.datetime.today() + datetime.timedelta(days=31))

split_days = rrule(MONTHLY,dtstart=begin_day,until=end_day)

for ld, rd in zip(*[iter(split_days[i:]) for i in range(2)]):

    print ld, rd

- 其他问题：

ISO Time (ISO 8601) in Python?

 

How to parse an ISO 8601-formatted date?

https://stackoverflow.com/questions/127803/how-to-parse-an-iso-8601-formatted-date

- 参考：

http://www.wklken.me/posts/2015/03/03/python-base-datetime.html

http://blog.sina.com.cn/s/blog_b09d460201018o0v.html