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In [2]: pd.json.dumps(pd.Timestamp('2013-01-01'), iso_dates=True) Out[2]: '"699470488266606557-01-01T00:00:00.000Z"'
should be
In [4]: pd.json.dumps(pd.Timestamp('2013-01-01'), iso_dates=True) Out[4]: '"2013-01-01T00:00:00.000Z"'