diff --git a/repository/MessagePack-Pharo-Core.package/MpPhPortableUtil.class/instance/timestampFromSeconds.nanos..st b/repository/MessagePack-Pharo-Core.package/MpPhPortableUtil.class/instance/timestampFromSeconds.nanos..st
new file mode 100644
index 0000000..270fc07
--- /dev/null
+++ b/repository/MessagePack-Pharo-Core.package/MpPhPortableUtil.class/instance/timestampFromSeconds.nanos..st
@@ -0,0 +1,6 @@
+actions
+timestampFromSeconds: seconds nanos: nanoSeconds
+	| ts |
+	ts := DateAndTime fromSeconds: seconds + 2177452800 offset: 0.
+	nanoSeconds > 0 ifTrue: [ ts setNanoSeconds: nanoSeconds].
+	^ts
\ No newline at end of file