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Description
Code Sample
In [99]: ts = Timestamp('2013-01-10 00:00:00-0500', tz='US/Eastern')
In [100]: pd.io.json.dumps(ts, iso_dates=True)
Out[100]: '"2013-01-10T05:00:00.000Z"'
Expected Output
In [100]: pd.io.json.dumps(ts, iso_dates=True)
Out[100]: '"2013-01-10T00:00:00.000-05:00"'
cf
In [109]: ts.isoformat()
Out[109]: '2013-01-10T00:00:00-05:00'