在 pandas 的时间戳中添加偏移量 [英] Adding offset to timestamp in pandas
本文介绍了在 pandas 的时间戳中添加偏移量的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个数据帧df,运行print(df.index)时,我得到:
I have a dataframe df and when I run print(df.index), I get:
DatetimeIndex(['2011-08-05 00:00:00-04:00', '2011-08-05 01:00:00-04:00',
'2011-08-05 02:00:00-04:00', '2011-08-05 03:00:00-04:00',
'2011-08-05 04:00:00-04:00', '2011-08-05 05:00:00-04:00',
'2011-08-05 06:00:00-04:00', '2011-08-05 07:00:00-04:00',
'2011-08-05 08:00:00-04:00', '2011-08-05 09:00:00-04:00',
...
'2017-07-30 14:00:00-04:00', '2017-07-30 15:00:00-04:00',
'2017-07-30 16:00:00-04:00', '2017-07-30 17:00:00-04:00',
'2017-07-30 18:00:00-04:00', '2017-07-30 19:00:00-04:00',
'2017-07-30 20:00:00-04:00', '2017-07-30 21:00:00-04:00',
'2017-07-30 22:00:00-04:00', '2017-07-30 23:00:00-04:00'],
dtype='datetime64[ns, America/New_York]', name=u'Time', length=52488, freq=None)
我正在尝试修改datetimeindex对象,以使
I am trying to modify the datetimeindex object, so that the
- 该系列中的第一个时间戳从
'2011-08-05 00:00:00-04:00'
更改为'2011-08-04 20:00:00'
和
- 系列中的第二张邮票将从
'2011-08-05 00:00:00-04:00'
到'2011-08-04 21:00:00'
, 等等。
- First timestamp in the series is changed from
'2011-08-05 00:00:00-04:00'
to'2011-08-04 20:00:00'
and
- Second stamp in the series would be changed from
'2011-08-05 00:00:00-04:00'
to'2011-08-04 21:00:00'
, and so on.
我尝试了 pd.to_datetime(df.index,format ='%Y-%m-%d %H:%M:%S')
,但它返回与上述相同的 datetimeindex
对象。
I tried pd.to_datetime(df.index, format='%Y-%m-%d %H:%M:%S')
, but it returns the same datetimeindex
object as above.
如果将时间戳转换为字符串,可以接受,所以我尝试了:
It is OK with me if the timestamps are converted to string, so I tried:
df.index.strftime('%Y-%m-%d %H:%M:%S')
但是没有代码行达到我的最终目标。
But neither lines of code achieves my end goal.
推荐答案
使用 tz_convert
删除时区
s并添加小时
s:
Use tz_convert
for remove timezone
s and add Hour
s:
df.index.tz_convert(None) + pd.offsets.Hour(16)
或:
df.index.tz_convert(None) + pd.Timedelta(16, unit='h')
示例:
idx = ['2011-08-05 00:00:00-04:00', '2011-08-05 01:00:00-04:00',
'2011-08-05 02:00:00-04:00', '2011-08-05 03:00:00-04:00']
idx = pd.DatetimeIndex(idx).tz_localize('UTC').tz_convert('America/New_York')
print (idx)
DatetimeIndex(['2011-08-05 00:00:00-04:00', '2011-08-05 01:00:00-04:00',
'2011-08-05 02:00:00-04:00', '2011-08-05 03:00:00-04:00'],
dtype='datetime64[ns, America/New_York]', freq=None)
idx = idx.tz_convert(None) + pd.offsets.Hour(16)
print (idx)
DatetimeIndex(['2011-08-05 20:00:00', '2011-08-05 21:00:00',
'2011-08-05 22:00:00', '2011-08-05 23:00:00'],
dtype='datetime64[ns]', freq='H')
这篇关于在 pandas 的时间戳中添加偏移量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!
查看全文