do not fetch date on every parse

Author: yuzawa-san

iabgpp-encoder/src/main/java/com/iab/gpp/encoder/segment/TcfCaV1CoreSegment.java

@@ -34,7 +34,8 @@ public TcfCaV1CoreSegment(String encodedString) {
 
   @Override
   protected EncodableBitStringFields initializeFields() {
-    Instant date = Instant.now();
+    // NOTE: TcfCaV1.setFieldValue records modifications
+    Instant date = Instant.EPOCH;
 
     EncodableBitStringFields fields = new EncodableBitStringFields(TcfCaV1Field.TCFCAV1_CORE_SEGMENT_FIELD_NAMES);
     fields.put(TcfCaV1Field.VERSION, new EncodableFixedInteger(6, TcfCaV1.VERSION));

iabgpp-encoder/src/main/java/com/iab/gpp/encoder/segment/TcfEuV2CoreSegment.java

@@ -34,7 +34,8 @@ public TcfEuV2CoreSegment(String encodedString) {
 
   @Override
   protected EncodableBitStringFields initializeFields() {
-    Instant date = Instant.now();
+    // NOTE: TcfEuV2.setFieldValue records modifications
+    Instant date = Instant.EPOCH;
 
     EncodableBitStringFields fields = new EncodableBitStringFields(TcfEuV2Field.TCFEUV2_CORE_SEGMENT_FIELD_NAMES);
     fields.put(TcfEuV2Field.VERSION, new EncodableFixedInteger(6, TcfEuV2.VERSION));