import os
import numpy as np
import datetime

def np_time_convert(dt64):
    unix_epoch = np.datetime64(0, 's')
    one_second = np.timedelta64(1, 's')
    seconds_since_epoch = (dt64 - unix_epoch) / one_second

    return datetime.datetime.utcfromtimestamp(seconds_since_epoch)

def create_output_dir(path, clear=False):
    if not os.path.exists(path):
        os.makedirs(path)
    elif clear:
        raise Exception('clear not implemented')