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datetime64.astype(datetime.datetime) returns int for dates in the far future #7945
Description
The largest year number allowed in a date or datetime object. MAXYEAR is 9999.
The range for datetime64 may be larger, depending on the type.
When converting a datetime64 that is out of range for datetime.datetime, we get an integer back:
In [21]: future = datetime64(10**12, 's')
In [22]: print(future)
33658-09-27T01:46:40
In [23]: print(future.astype(datetime64))
33658-09-27T01:46:40
In [24]: print(future.astype(datetime.datetime))
1000000000000
Converting datetime64(NaT) returns None:
In [40]: print(datetime64('NaT').astype(datetime.datetime))
None
In both cases, this should probably raise some kind of warning or error, perhaps in agreement with numpys errstate (geterr/seterr) for invalid.
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