I have a DataFrame with three columns, one date and two times. It's like this:
date hour_in hour_out
0 01/06/2016 08:15 19:37
1 02/06/2016 08:26 17:31
2 03/06/2016 08:08 21:31
I'm trying to convert hour_in
and hour_out
to timedelta using this code (which is based on an answer on this question Dates from 1900-01-01 are added to my 'Time' after using df['Time'] = pd.to_datetime(phData['Time'], format='%H:%M:%S') ):
df['hora_entrada'] = pd.to_timedelta(df['hora_entrada'], errors='coerce')
df['hora_saida'] = pd.to_timedelta(df['hora_saida'] , errors='coerce')
After the cast, my column is converted to the correct dtype timedelta64[ns]
, but all the values are set to NaT
. My df.info()
returns this:
<class 'pandas.core.frame.DataFrame'>
RangeIndex: 439 entries, 0 to 438
Data columns (total 4 columns):
data 439 non-null datetime64[ns]
hour_in 0 non-null timedelta64[ns]
hour_out 0 non-null timedelta64[ns]
dtypes: datetime64[ns](1), timedelta64[ns](2)
And the data output is like this:
data hora_entrada hora_saida
0 2016-06-01 NaT NaT
1 2016-06-02 NaT NaT
2 2016-06-03 NaT NaT
I've tried to convert the time columns to datetime
and then to timedelta
but I got strange results. Here's an example:
data hora_entrada hora_saida
0 2016-06-01 -25567 days +08:15:00 -25567 days +19:37:00
1 2016-06-02 -25567 days +08:26:00 -25567 days +17:31:00
2 2016-06-03 -25567 days +08:08:00 -25567 days +21:31:00
I think it's because when I convert it to datetime
it's appended to the hour a date 1900-01-01
.
Consider the following approach:
In [24]: pd.to_timedelta(df.hour_in + ':00', errors='coerce')
Out[24]:
0 08:15:00
1 08:26:00
2 08:08:00
Name: hour_in, dtype: timedelta64[ns]
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