Unhandled Date format type from api calls

[erezKaufmann]

From the Selling Partner api, finances api returns Date format of type ISO 8601, but type.gen.go files do not handle it correctly, causing processes such as Parse function (ParseListFinancialEventsResp, ParseListFinancialEventsByOrderIdResp etc.) to fail:

Error: json: cannot unmarshal string into Go struct field ShipmentEvent.payload.FinancialEvents.ShipmentEventList.PostedDate of type finances.Date

In order to fix that, we should define Date as struct, and implement an unmarshalJson for Date:

// Date defines model for Date.
type Date struct {
    time.Time
}


// UnmarshalJSON implements the json.Unmarshaler interface for Date
func (d *Date) UnmarshalJSON(data []byte) error {
    // Remove quotes
    s := strings.Trim(string(data), "\"")
    
    // Parse the time using the correct layout
    t, err := time.Parse(time.RFC3339, s)
    if err != nil {
        layouts := []string{
            "2006-01-02T15:04:05Z07:00",
            "2006-01-02T15:04:05Z",
            "2006-01-02T15:04:05",
            "2006-01-02",
        }

        for _, layout := range layouts {
            if t, err = time.Parse(layout, s); err == nil {
                break
            }
        }

        if err != nil {
            return err
        }
    }
    
    d.Time = t
    return nil
}

I noticed this issue when trying to implement a new call for the finances api, but this could also happen on other apis