diff --git a/testdata/NewTimestamp.pidx b/testdata/NewTimestamp.pidx
new file mode 100644
index 0000000..e58a521
--- /dev/null
+++ b/testdata/NewTimestamp.pidx
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8" ?> 
+<index schemaVersion="1.1.0" xs:noNamespaceSchemaLocation="PackIndex.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance">
+<vendor>Keil</vendor>
+<url>https://www.keil.com/pack/</url>
+<timestamp>2044-11-26T04:01:41.5636929+00:00</timestamp>
+<pindex>
+  <pdsc url="https://www.silabs.com/documents/public/cmsis-packs/" vendor="SiliconLabs" name="BGM21_DFP" version="5.8.10" deprecated="2019-11-12" replacement="SiliconLabs.GeckoPlatform_BGM21_DFP" />
+</pindex>
+</index>
diff --git a/testdata/OldTimestamp.pidx b/testdata/OldTimestamp.pidx
new file mode 100644
index 0000000..d6c938b
--- /dev/null
+++ b/testdata/OldTimestamp.pidx
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8" ?> 
+<index schemaVersion="1.1.0" xs:noNamespaceSchemaLocation="PackIndex.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance">
+<vendor>Keil</vendor>
+<url>https://www.keil.com/pack/</url>
+<timestamp>2024-11-20T04:01:41.5636929+00:00</timestamp>
+<pindex>
+  <pdsc url="https://www.silabs.com/documents/public/cmsis-packs/" vendor="SiliconLabs" name="BGM21_DFP" version="5.8.10" deprecated="2019-11-12" replacement="SiliconLabs.GeckoPlatform_BGM21_DFP" />
+</pindex>
+</index>