lukemanley commented on issue #35088:
URL: https://github.com/apache/arrow/issues/35088#issuecomment-1509992225

   Thanks for the explanation. It looks like numpy uses that value (min int64) 
for NaT:
   
   ```
   In [1]: import numpy as np
   
   In [2]: np.datetime64("NaT").astype(int)
   Out[2]: -9223372036854775808
   
   In [3]: np.array([-9223372036854775808], dtype="m8[ns]")
   Out[3]: array(['NaT'], dtype='timedelta64[ns]')
   ```


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