anchor.diff:                  "meteoGroupStationName": "Pleucadeuc",
                   "stationLocation": [ -2.2323, 47.4593 ],
                   "stationTimeZoneName": "Europe/Prague",
  -                "observedFrom": "2016-10-15T08:00:00Z",
  -                "observedUntil": "2016-10-15T09:00:00Z",
  +                "observedFrom": "2016-10-15T10:00:00+02:00",
  +                "observedUntil": "2016-10-15T11:00:00+02:00",
                   "observedPeriod": "PT1H",
                   "windGustInMeterPerSecond": 0.97744447,
                   "windGustInKilometerPerHour": 3.5188,
  
positive.code:                 "meteoGroupStationName": "Pleucadeuc",
                  "stationLocation": [ -2.2323, 47.4593 ],
                  "stationTimeZoneName": "Europe/Prague",
                  "observedFrom": "2016-10-14T21:00:00Z",
                  "observedUntil": "2016-10-15T09:00:00Z",
                  "observedPeriod": "PT12H",
                  "temperatureMaxInCelsius": 2.5,
                  "temperatureMaxInFahrenheit": 36.5,
  
negative.code:                 "meteoGroupStationName": "Pleucadeuc",
                  "stationLocation": [ -2.2323, 47.4593 ],
                  "stationTimeZoneName": "Europe/Prague",
                  "observedFrom": "2016-10-15T07:00:00+02:00",
                  "observedUntil": "2016-10-15T10:00:00+02:00",
                  "observedPeriod": "PT3H",
                  "pressureChangeInHectoPascal": 2,
                  "pressureTendencyDescription": "INCREASING_THEN_STEADY",
  