diff --git a/clients/bigquery/converters/converters.go b/clients/bigquery/converters/converters.go
index e071e49c7..efe9952e5 100644
--- a/clients/bigquery/converters/converters.go
+++ b/clients/bigquery/converters/converters.go
@@ -4,13 +4,21 @@ import (
 	"fmt"
 	"strconv"
 
+	"github.com/artie-labs/transfer/lib/typing"
+
 	"github.com/artie-labs/transfer/lib/typing/decimal"
 	"github.com/artie-labs/transfer/lib/typing/ext"
 )
 
-type StringConverter struct{}
+type StringConverter struct {
+	kd typing.KindDetails
+}
+
+func NewStringConverter(kd typing.KindDetails) StringConverter {
+	return StringConverter{kd: kd}
+}
 
-func (StringConverter) Convert(value any) (any, error) {
+func (s StringConverter) Convert(value any) (any, error) {
 	switch castedValue := value.(type) {
 	case string:
 		return castedValue, nil
@@ -19,7 +27,11 @@ func (StringConverter) Convert(value any) (any, error) {
 	case bool:
 		return fmt.Sprint(castedValue), nil
 	case *ext.ExtendedTime:
-		return castedValue.String(""), nil
+		if err := s.kd.EnsureExtendedTimeDetails(); err != nil {
+			return nil, err
+		}
+
+		return castedValue.GetTime().Format(s.kd.ExtendedTimeDetails.Format), nil
 	default:
 		return nil, fmt.Errorf("expected string/*decimal.Decimal/bool received %T with value %v", value, value)
 	}
diff --git a/clients/bigquery/storagewrite.go b/clients/bigquery/storagewrite.go
index 63605a827..d6933eb98 100644
--- a/clients/bigquery/storagewrite.go
+++ b/clients/bigquery/storagewrite.go
@@ -158,7 +158,7 @@ func rowToMessage(row map[string]any, columns []columns.Column, messageDescripto
 
 			message.Set(field, protoreflect.ValueOfString(decimalValue.String()))
 		case typing.String.Kind:
-			val, err := converters.StringConverter{}.Convert(value)
+			val, err := converters.NewStringConverter(column.KindDetails).Convert(value)
 			if err != nil {
 				return nil, err
 			}
diff --git a/lib/typing/ext/time.go b/lib/typing/ext/time.go
index d84c2ea5b..93243eb41 100644
--- a/lib/typing/ext/time.go
+++ b/lib/typing/ext/time.go
@@ -81,8 +81,3 @@ func (e *ExtendedTime) GetTime() time.Time {
 func (e *ExtendedTime) GetNestedKind() NestedKind {
 	return e.nestedKind
 }
-
-func (e *ExtendedTime) String(overrideFormat string) string {
-	format := cmp.Or(overrideFormat, e.nestedKind.Format)
-	return e.ts.Format(format)
-}
diff --git a/lib/typing/typing.go b/lib/typing/typing.go
index 1441ddaf3..38c71af5d 100644
--- a/lib/typing/typing.go
+++ b/lib/typing/typing.go
@@ -33,6 +33,10 @@ func (k *KindDetails) EnsureExtendedTimeDetails() error {
 		return fmt.Errorf("extended time details is not set")
 	}
 
+	if k.ExtendedTimeDetails.Format == "" {
+		return fmt.Errorf("extended time details format is not set")
+	}
+
 	return nil
 }