diff --git a/goextVersion.go b/goextVersion.go
index 97d072d..a2b2f78 100644
--- a/goextVersion.go
+++ b/goextVersion.go
@@ -1,5 +1,5 @@
 package goext
 
-const GoextVersion = "0.0.313"
+const GoextVersion = "0.0.314"
 
-const GoextVersionTimestamp = "2023-11-10T13:26:30+0100"
+const GoextVersionTimestamp = "2023-11-10T13:37:54+0100"
diff --git a/mongoext/registry.go b/mongoext/registry.go
index 9548cee..e6b670f 100644
--- a/mongoext/registry.go
+++ b/mongoext/registry.go
@@ -18,14 +18,14 @@ func CreateGoExtBsonRegistry() *bsoncodec.Registry {
 	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.RFC3339NanoTime{}), rfctime.RFC3339NanoTime{})
 	rb.RegisterTypeDecoder(reflect.TypeOf(&rfctime.RFC3339NanoTime{}), rfctime.RFC3339NanoTime{})
 
-	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.RFC3339NanoTime{}), rfctime.UnixTime{})
-	rb.RegisterTypeDecoder(reflect.TypeOf(&rfctime.RFC3339NanoTime{}), rfctime.UnixTime{})
+	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.UnixTime{}), rfctime.UnixTime{})
+	rb.RegisterTypeDecoder(reflect.TypeOf(&rfctime.UnixTime{}), rfctime.UnixTime{})
 
-	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.RFC3339NanoTime{}), rfctime.UnixMilliTime{})
-	rb.RegisterTypeDecoder(reflect.TypeOf(&rfctime.RFC3339NanoTime{}), rfctime.UnixMilliTime{})
+	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.UnixMilliTime{}), rfctime.UnixMilliTime{})
+	rb.RegisterTypeDecoder(reflect.TypeOf(&rfctime.UnixMilliTime{}), rfctime.UnixMilliTime{})
 
-	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.RFC3339NanoTime{}), rfctime.UnixNanoTime{})
-	rb.RegisterTypeDecoder(reflect.TypeOf(&rfctime.RFC3339NanoTime{}), rfctime.UnixNanoTime{})
+	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.UnixNanoTime{}), rfctime.UnixNanoTime{})
+	rb.RegisterTypeDecoder(reflect.TypeOf(&rfctime.UnixNanoTime{}), rfctime.UnixNanoTime{})
 
 	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.Date{}), rfctime.Date{})
 	rb.RegisterTypeDecoder(reflect.TypeOf(&rfctime.Date{}), rfctime.Date{})
diff --git a/rfctime/seconds.go b/rfctime/seconds.go
index e185e19..a9bc57e 100644
--- a/rfctime/seconds.go
+++ b/rfctime/seconds.go
@@ -2,7 +2,14 @@ package rfctime
 
 import (
 	"encoding/json"
+	"errors"
+	"fmt"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/bsoncodec"
+	"go.mongodb.org/mongo-driver/bson/bsonrw"
+	"go.mongodb.org/mongo-driver/bson/bsontype"
 	"gogs.mikescher.com/BlackForestBytes/goext/timeext"
+	"reflect"
 	"time"
 )
 
@@ -54,6 +61,63 @@ func (d SecondsF64) MarshalJSON() ([]byte, error) {
 	return json.Marshal(secs)
 }
 
+func (d *SecondsF64) UnmarshalBSONValue(bt bsontype.Type, data []byte) error {
+	if bt == bson.TypeNull {
+		// we can't set nil in UnmarshalBSONValue (so we use default(struct))
+		// Use mongoext.CreateGoExtBsonRegistry if you need to unmarsh pointer values
+		// https://stackoverflow.com/questions/75167597
+		// https://jira.mongodb.org/browse/GODRIVER-2252
+		*d = SecondsF64(0)
+		return nil
+	}
+	if bt != bson.TypeDouble {
+		return errors.New(fmt.Sprintf("cannot unmarshal %v into SecondsF64", bt))
+	}
+	var tt float64
+	err := bson.RawValue{Type: bt, Value: data}.Unmarshal(&tt)
+	if err != nil {
+		return err
+	}
+	*d = SecondsF64(tt)
+	return nil
+}
+
+func (d SecondsF64) MarshalBSONValue() (bsontype.Type, []byte, error) {
+	return bson.MarshalValue(d.Seconds())
+}
+
+func (d SecondsF64) DecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	if val.Kind() == reflect.Ptr && val.IsNil() {
+		if !val.CanSet() {
+			return errors.New("ValueUnmarshalerDecodeValue")
+		}
+		val.Set(reflect.New(val.Type().Elem()))
+	}
+
+	tp, src, err := bsonrw.Copier{}.CopyValueToBytes(vr)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr && len(src) == 0 {
+		val.Set(reflect.Zero(val.Type()))
+		return nil
+	}
+
+	err = d.UnmarshalBSONValue(tp, src)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr {
+		val.Set(reflect.ValueOf(&d))
+	} else {
+		val.Set(reflect.ValueOf(d))
+	}
+
+	return nil
+}
+
 func NewSecondsF64(t time.Duration) SecondsF64 {
 	return SecondsF64(t)
 }
diff --git a/rfctime/unix.go b/rfctime/unix.go
index 91529b1..93a7b3c 100644
--- a/rfctime/unix.go
+++ b/rfctime/unix.go
@@ -76,7 +76,7 @@ func (t *UnixTime) UnmarshalBSONValue(bt bsontype.Type, data []byte) error {
 		return nil
 	}
 	if bt != bson.TypeDateTime {
-		return errors.New(fmt.Sprintf("cannot unmarshal %v into RFC3339NanoTime", bt))
+		return errors.New(fmt.Sprintf("cannot unmarshal %v into UnixTime", bt))
 	}
 	var tt time.Time
 	err := bson.RawValue{Type: bt, Value: data}.Unmarshal(&tt)
diff --git a/rfctime/unixMilli.go b/rfctime/unixMilli.go
index 44e6956..679aa00 100644
--- a/rfctime/unixMilli.go
+++ b/rfctime/unixMilli.go
@@ -76,7 +76,7 @@ func (t *UnixMilliTime) UnmarshalBSONValue(bt bsontype.Type, data []byte) error
 		return nil
 	}
 	if bt != bson.TypeDateTime {
-		return errors.New(fmt.Sprintf("cannot unmarshal %v into RFC3339NanoTime", bt))
+		return errors.New(fmt.Sprintf("cannot unmarshal %v into UnixMilliTime", bt))
 	}
 	var tt time.Time
 	err := bson.RawValue{Type: bt, Value: data}.Unmarshal(&tt)
diff --git a/rfctime/unixNano.go b/rfctime/unixNano.go
index 5bf5a09..aa5d6c1 100644
--- a/rfctime/unixNano.go
+++ b/rfctime/unixNano.go
@@ -76,7 +76,7 @@ func (t *UnixNanoTime) UnmarshalBSONValue(bt bsontype.Type, data []byte) error {
 		return nil
 	}
 	if bt != bson.TypeDateTime {
-		return errors.New(fmt.Sprintf("cannot unmarshal %v into RFC3339NanoTime", bt))
+		return errors.New(fmt.Sprintf("cannot unmarshal %v into UnixNanoTime", bt))
 	}
 	var tt time.Time
 	err := bson.RawValue{Type: bt, Value: data}.Unmarshal(&tt)