def show_times(df, cols):
    out = df.copy()
    for col in cols:
        out[col] = pd.to_datetime(out[col], unit='s')
    return out
def show_times(df, cols):
    out = df.copy()
    for col in cols:
        out[col] = pd.to_datetime(out[col], unit='s')
    return out