1import h5py
2import numpy as np
3
4arr = np.array([np.datetime64('2019-09-22T17:38:30')])
5
6with h5py.File('datetimes.h5', 'w') as f:
7    # Create dataset
8    f['data'] = arr.astype(h5py.opaque_dtype(arr.dtype))
9
10    # Read
11    print(f['data'][:])
12