histogram_filling.py 文件源码

def to_ns(x):
    """Convert input timestamps to nanoseconds (integers)

    :param x: value to be converted
    :returns: converted value
    :rtype: int
    """

    if pd.isnull(x):
        return 0
    try:
        return pd.to_datetime(x).value
    except:
        if hasattr(x, '__str__'):
            return pd.to_datetime(str(x)).value
    return 0