fastai_datepart.py

def add_datepart(df, fldname, drop=True):
    fld = df[fldname]
    if not np.issubdtype(fld.dtype, np.datetime64):
        df[fldname] = fld = pd.to_datetime(fld, infer_datetime_format=True)
    targ_pre = re.sub('[Dd]ate$', '', fldname)
    for n in ('Year', 'Month', 'Week', 'Day', 'Dayofweek', 'Dayofyear',
            'Is_month_end', 'Is_month_start', 'Is_quarter_end', 'Is_quarter_start', 'Is_year_end', 'Is_year_start'):
        df[targ_pre+n] = getattr(fld.dt,n.lower())
    df[targ_pre+'Elapsed'] = fld.astype(np.int64) // 10**9
    if drop: df.drop(fldname, axis=1, inplace=True)