将Pandas DF列从UTC转换为没有日期的美国东部时间 [英] Convert Pandas DF column from UTC to US-Eastern time without date

问题描述

我有此Pandas数据框列:

I have this Pandas dataframe column:

                     time_UTC
0   2015-01-05 16:44:34+00:00
1   2015-08-11 16:44:38+00:00
2   2015-08-02 16:53:25+00:00
3   2015-08-17 16:53:25+00:00
4   2015-09-28 16:53:26+00:00
Name: time_UTC, dtype: datetime64[ns, UTC]

，然后我使用以下命令将其从UTC转换为美国东部时区:

and I converted it from UTC to US-Eastern timezone using:

list_temp = []
    for row in df['time_UTC']:
        list_temp.append(Timestamp(row, tz = 'UTC').tz_convert('US/Eastern'))
    df['time_EST'] = list_temp

得到这个:

0   2015-01-05 11:44:34-05:00
1   2015-08-11 11:44:38-05:00
2   2015-08-02 11:53:25-05:00
3   2015-08-17 11:53:25-05:00
4   2015-09-28 11:53:26-05:00
Name: time_EST, dtype: datetime64[ns, US/Eastern]

现在，我需要删除条目中的日期部分，以便仅获得时间.这是我需要的:

Now, I need to drop the date part of the entries so that I only get the time. Here is what I need:

0   11:44:34-05:00
1   11:44:38-05:00
2   11:53:25-05:00
3   11:53:25-05:00
4   11:53:26-05:00
Name: time_EST, dtype: datetime64[ns, US/Eastern]

尝试:

我尝试过:

print df['time_EST'].apply(lambda x: dt.time(x.hour,x.minute,x.second))

进行转换，以便删除日期，我只有时间.但是它正在恢复为UTC时区.这是上面命令的输出:

The conversion is made so that date is dropped and I only get time. But it is reverting back to the UTC timezone. Here is the output of the above command:

0    16:44:34
1    16:44:38
2    16:53:25
3    16:53:25
4    16:53:26
Name: time_EST, dtype: object

问题:

有没有办法在不自动恢复为UTC的情况下将日期和时间保持为美国东部时间?

Is there a way to drop the date and keep time as US-Eastern, without automatically reverting back to UTC?

要重新创建问题，只需复制上面的第一个DataFrame并使用此代码:

To recreate the problem, just copy the first DataFrame above and use this code:

import pandas as pd
from pandas.lib import Timestamp
import datetime as dt
df = pd.read_clipboard()

然后复制问题中其余的代码行.对于此问题的任何帮助将不胜感激.

Then copy the remaining lines of code from the question. Any assistance with this problem would be greatly appreciated.

推荐答案

您要使用strftime设置字符串格式，还请注意矢量化日期操作:

You want to use strftime to format your string, also note the vectorized date manipulations:

df = pd.read_clipboard()
df.time_UTC = pd.to_datetime(df.time_UTC)
df['EST'] = (df.time_UTC.dt.tz_localize('UTC')
                        .tz_convert('US/Eastern')
                        .strftime("%H:%M:%S"))

In [41]: df
Out[41]:
                               time_UTC       EST
time_UTC
2016-02-15 16:44:34 2016-02-15 16:44:34  11:44:34
2016-02-15 16:44:38 2016-02-15 16:44:38  11:44:38
2016-02-15 16:53:25 2016-02-15 16:53:25  11:53:25
2016-02-15 16:53:25 2016-02-15 16:53:25  11:53:25
2016-02-15 16:53:26 2016-02-15 16:53:26  11:53:26

这篇关于将Pandas DF列从UTC转换为没有日期的美国东部时间的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！