python-datetime

问题 Here is the code which first parses time from string in IST and then converts that to UTC. So when it 4:00 pm in India the time in GMT / UTC is 10:30 am. While the following code prints it as 9:30 pm. So instead of subtracting the offset it is adding the offset. From the python documentation https://docs.python.org/2/library/datetime.html#datetime.datetime.astimezone the sample implementation of astimezone, it does appear that it would add the offset if it is negative but it seems contrary to

问题 I am working on automating a report which is presently handled in Excel. As part of this, I wanted a Python equivalent of Excel's Weeknum function (Using System 1. Reference here ) which considers the week having 1st Jan as Week 1. PS: I already tried ISOCalendar but it gives a wrong week as its week starts from Monday. I also tried the strftime("%U") and it returns the same wrong number. Can someone help on this? 回答1: Here is the pseudocode. You can make it into Python. You'll define a

问题 Date is datetime.date(2013, 12, 30) I am trying to get week number using import datetime datetime.date(2013, 12, 30).isocalendar()[1] I am getting output as , 1 Why i am not getting week number of last year , instead i am getting week number of current year? Whats wrong i am doing here ? 回答1: You are doing nothing wrong, 2013/12/30 falls in week 1 of 2014, according to the ISO8601 week numbering standard: The ISO 8601 definition for week 01 is the week with the year's first Thursday in it.

问题 I am trying to set different timezones for various rows in a Pandas dataframe based on a criterion. As a MWE, here is what I have tried: test = pd.DataFrame( data = pd.to_datetime(['2015-03-30 20:12:32','2015-03-12 00:11:11']) ,columns=['time'] ) test['new_col']=['new','old'] test.time=test.set_index('time').index.tz_localize('UTC') test.loc[test.new_col=='new','time']=test[test.new_col=='new'].set_index('time').index.tz_convert('US/Pacific') print test The output of this: time new_col 0

问题 I am trying to set different timezones for various rows in a Pandas dataframe based on a criterion. As a MWE, here is what I have tried: test = pd.DataFrame( data = pd.to_datetime(['2015-03-30 20:12:32','2015-03-12 00:11:11']) ,columns=['time'] ) test['new_col']=['new','old'] test.time=test.set_index('time').index.tz_localize('UTC') test.loc[test.new_col=='new','time']=test[test.new_col=='new'].set_index('time').index.tz_convert('US/Pacific') print test The output of this: time new_col 0

问题 Given a ISO 8601 duration string, how do I convert it into a datetime.timedelta ? This didn't work: timedelta("PT1H5M26S", "T%H%M%S") 回答1: I found isodate library to do exactly what I want isodate.parse_duration('PT1H5M26S') 来源： https://stackoverflow.com/questions/36976138/is-there-an-easy-way-to-convert-iso-8601-duration-to-timedelta

问题 I have a dataframe with meteorological data every 30 minutes . With my datetime index I need to create a column with timestamps , but it must be in decimal . Here's the example below: In [134]: df.index[0:3] Out[134]: DatetimeIndex(['2016-01-01 00:30:00', '2016-01-01 01:00:00', '2016-01-01 01:30:00'], dtype='datetime64[ns]', name='date_time', freq=None) I need create a column as follows: df.new[0:3] 0.5,1,1.5 Where have 30 minutes i transform in .5 . Follow my script: import pandas as pd

问题 I have data points whose abscissas are datetime.datetime objects with a time zone (their tzinfo happens to be a bson.tz_util.FixedOffset obtained through MongoDB). When I plot them with scatter() , what is the time zone of the tick labels? Changing the timezone in matplotlibrc does not change anything in the displayed plot (I must have misunderstood the discussion on time zones in the Matplotlib documentation). I experimented a little with plot() (instead of scatter() ). When given a single

问题 Why django DateTimeField restore tzinfo in datetime to <utc> ? Below is my test code. Is it normal or wrong.? If it is normal, what is the reason? models.py class Date(models.Model): datetime = models.DateTimeField() settings.py TIME_ZONE = 'Asia/Seoul' USE_TZ = True test.py from django.utils import timezone datetime = timezone.localtime(timezone.localtimezone.now()) #now datetime is datetime.datetime(2015, 10, 22, 20, 31, 56, 248000, tzinfo=<DstTzInfo 'Asia/Seoul' KST+9:00:00 STD>) models

问题 With this function: timestamp = datetime.strptime(date_str, date_fmt) I am getting this error: ValueError: time data 'Sun, 28 Oct 2018 07:33:13 -0400 (EDT)' does not match format '%a, %d %b %Y %H:%M:%S %z (%Z)' Sun, 28 Oct 2018 07:33:13 -0400 (EDT) %a, %d %b %Y %H:%M:%S %z (%Z) I've looked over it a dozen times and I can't figure out what I am doing wrong. My Python Version: Python 3.7.0 (default, Jul 23 2018, 20:24:19) 回答1: There is no support for %Z on input for anything other than your