python处理时间和日期

Posted 2021-02-08 冰山上的博客

time and date

（error correction in graph (Datetime obj->string)：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

 

- iteration:

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")
 
cur_tuple = begin_tuple
while cur_tuple <= end_tuple:
    cur = cur_tuple.strftime("%Y%m%d")
    print cur
    cur_tuple += datetime.timedelta(days=30)

 

- use dateutil:

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

 

- parse an ISO 8601-formatted date:

import datetime
import dateutil.parser
import pytz
dt = dateutil.parser.isoparse("2020-05-11T02:00:15.696+0530").astimezone(UTC)
dt2 = datetime.datetime.strptime("2015-11-01", "%Y-%m-%d").replace(tzinfo=pytz.UTC)

How to parse an ISO 8601-formatted date?

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

convert string having timezone into to utc datetime object python

https://stackoverflow.com/questions/50679349/convert-string-having-timezone-into-to-utc-datetime-object-python

TypeError: can\'t compare offset-naive and offset-aware datetimes

https://stackoverflow.com/questions/15307623/cant-compare-naive-and-aware-datetime-now-challenge-datetime-end

 

- reference:

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

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