diff --git a/libE57Format b/libE57Format
index f9cc0d2..1914b8e 160000
--- a/libE57Format
+++ b/libE57Format
@@ -1 +1 @@
-Subproject commit f9cc0d2e5f46b0f887e3628c668ae00762e9ccd6
+Subproject commit 1914b8ea972251d3bb49a33828497dde683205d9
diff --git a/src/pye57/e57.py b/src/pye57/e57.py
index 67427a7..4c7205a 100644
--- a/src/pye57/e57.py
+++ b/src/pye57/e57.py
@@ -103,7 +103,7 @@ def write_default_header(self):
         self.root.set("e57LibraryVersion", libe57.StringNode(imf, libe57.E57_LIBRARY_ID))
         self.root.set("coordinateMetadata", libe57.StringNode(imf, ""))
         creation_date_time = libe57.StructureNode(imf)
-        creation_date_time.set("dateTimeValue", libe57.FloatNode(imf, 10.0))
+        creation_date_time.set("dateTimeValue", libe57.FloatNode(imf, 0.0))
         creation_date_time.set("isAtomicClockReferenced", libe57.IntegerNode(imf, 0))
         self.root.set("creationDateTime", creation_date_time)
         self.root.set("data3D", libe57.VectorNode(imf, True))
diff --git a/tests/test_main.py b/tests/test_main.py
index 1f5a9b1..a2804a8 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -6,7 +6,6 @@
 
 import pye57
 from pye57 import libe57
-from pye57.utils import get_fields
 
 try:
     from exceptions import WindowsError
@@ -62,22 +61,6 @@ def test_constants():
     assert libe57.CHECKSUM_POLICY_SPARSE == 25
     assert libe57.CHECKSUM_POLICY_HALF == 50
     assert libe57.CHECKSUM_POLICY_ALL == 100
-    assert libe57.E57_INT8_MIN == -128
-    assert libe57.E57_INT8_MAX == 127
-    assert libe57.E57_INT16_MIN == -32768
-    assert libe57.E57_INT16_MAX == 32767
-    assert libe57.E57_INT32_MIN == -2147483647 - 1
-    assert libe57.E57_INT32_MAX == 2147483647
-    assert libe57.E57_INT64_MIN == -9223372036854775807 - 1
-    assert libe57.E57_INT64_MAX == 9223372036854775807
-    assert libe57.E57_UINT8_MIN == 0
-    assert libe57.E57_UINT8_MAX == 255
-    assert libe57.E57_UINT16_MIN == 0
-    assert libe57.E57_UINT16_MAX == 65535
-    assert libe57.E57_UINT32_MIN == 0
-    assert libe57.E57_UINT32_MAX == 4294967295
-    assert libe57.E57_UINT64_MIN == 0
-    assert libe57.E57_UINT64_MAX == 18446744073709551615
 
 
 def test_open_imagefile(e57_path):