diff --git a/account.go b/account.go
index f6f87f1..d22eba5 100644
--- a/account.go
+++ b/account.go
@@ -1,11 +1,13 @@
 package crunchyroll
 
+import "time"
+
 // Account contains information about a crunchyroll account.
 type Account struct {
-	AccountID     string `json:"account_id"`
-	ExternalID    string `json:"external_id"`
-	EmailVerified bool   `json:"email_verified"`
-	Created       string `json:"created"`
+	AccountID     string    `json:"account_id"`
+	ExternalID    string    `json:"external_id"`
+	EmailVerified bool      `json:"email_verified"`
+	Created       time.Time `json:"created"`
 
 	Avatar                           string `json:"avatar"`
 	CrBetaOptIn                      bool   `json:"cr_beta_opt_in"`
diff --git a/episode.go b/episode.go
index 07f6705..de38c65 100644
--- a/episode.go
+++ b/episode.go
@@ -79,8 +79,7 @@ type Episode struct {
 type HistoryEpisode struct {
 	*Episode
 
-	ID           string    `json:"id"`
-	DatePlayed   string    `json:"date_played"`
+	DatePlayed   time.Time `json:"date_played"`
 	ParentID     string    `json:"parent_id"`
 	ParentType   MediaType `json:"parent_type"`
 	Playhead     uint      `json:"playhead"`
diff --git a/utils.go b/utils.go
index 672772f..d32d39b 100644
--- a/utils.go
+++ b/utils.go
@@ -35,8 +35,19 @@ func encodeStructToQueryValues(s interface{}) (string, error) {
 	for i := 0; i < v.Type().NumField(); i++ {
 
 		// don't include parameters with default or without values in the query to avoid corruption of the API response.
-		if isEmptyValue(v.Field(i)) {
-			continue
+		switch v.Field(i).Kind() {
+		case reflect.Slice, reflect.String:
+			if v.Field(i).Len() == 0 {
+				continue
+			}
+		case reflect.Bool:
+			if !v.Field(i).Bool() {
+				continue
+			}
+		case reflect.Uint:
+			if v.Field(i).Uint() == 0 {
+				continue
+			}
 		}
 
 		key := v.Type().Field(i).Tag.Get("param")
@@ -59,15 +70,3 @@ func encodeStructToQueryValues(s interface{}) (string, error) {
 
 	return values.Encode(), nil
 }
-
-func isEmptyValue(v reflect.Value) bool {
-	switch v.Kind() {
-	case reflect.Slice, reflect.String:
-		return v.Len() == 0
-	case reflect.Bool:
-		return !v.Bool()
-	case reflect.Uint:
-		return v.Uint() == 0
-	}
-	return false
-}