Better handling of cookie expiry.

The expiry comparison was done using the cookie.Expire value, which turns
out isn't always set properly. However, the max age appears to always be
valid, so use this instead.

finance.go

@@ -197,18 +197,18 @@ func fetchCookies() (string, time.Time, error) {
 	var expiry = time.Now().AddDate(10, 0, 0)
 
 	for _, cookie := range response.Cookies() {
-		var unixTime = cookie.Expires.Unix()
 
-		// Skip invalid cookies
-		if unixTime <= 0 {
+		if cookie.MaxAge <= 0 {
 			continue
 		}
 
+		cookieExpiry := time.Now().Add(time.Duration(cookie.MaxAge) * time.Second)
+
 		if cookie.Name != "AS" {
 			result += cookie.Name + "=" + cookie.Value + "; "
 			// set expiry to the latest cookie expiry if smaller than the current expiry
-			if cookie.Expires.Before(expiry) {
-				expiry = cookie.Expires
+			if cookie.Expires.Before(cookieExpiry) {
+				expiry = cookieExpiry
 			}
 		}
 	}