Date conversion .NET JSON to ISO

Question

How can I convert a date time format from JSON.Net such as:

/Date(1154970000000+0700)/

To ISO-?? format 2011-12-18T23:34:59Z

Preferably in either Pyt

Answer 1

Here's a little class I wrote years ago to clean up this sort of invalid JSON that some .NET library generates:

class DotNETDecoder(simplejson.JSONDecoder):
    '''
    This is a decoder to convert .NET encoded JSON into python objects
    The motivation for this is the way .NET encodes dates.
    See:
    https://msdn.microsoft.com/en-us/library/bb299886.aspx#intro_to_json_topic2
    .NET encodes datetimes like this: "\/Date(628318530718)\/"
    '''

    def __init__(self, timezone, *args, **kwargs) -> None:
        super().__init__(*args, **kwargs)
        self.parse_string = self._date_parse_string(timezone)
        self.scan_once = py_make_scanner(self)

    @staticmethod
    def _date_parse_string(timezone):
        def _parse_string(string, idx, encoding, strict):
            obj = scanstring(string, idx, encoding, strict)
            if isinstance(obj[0], str):
                match = date_match.search(obj[0])
                if match:
                    return [dt.datetime.fromtimestamp(
                                int(match.group(1)) / 1000, timezone),
                            obj[1]]
            return obj
        return _parse_string

And a test case / example:

def test_can_decode_dotnet_json_dates():                                                                                                                                                                     
    jsonstr = '{"date": "Date(1330848000000)", "f": "b", "l": [], "i": 5}'                                                                                                                                   
    timezone = pytz.timezone('America/New_York')                                                                                                                                                             
    obj = json.loads(jsonstr, cls=DotNETDecoder, timezone=timezone)                                                                                                                                          
    assert obj['date'] == timezone.localize(dt.datetime(2012, 3, 4, 3, 0))                                                                                                                                   
    assert obj['f'] == "b"                                                                                                                                                                                   
    assert obj['i'] == 5                                                                                                                                                                                     
    assert obj['l'] == []