Use the raw timestamp source for rendering timestamps.

src/intermediate/timestamp.rs

@@ -1,5 +1,24 @@
 use super::macros::inoop;
+use super::macros::intermediate;
+use super::util::coalesce_whitespace;
 use crate::error::CustomError;
 use organic::types::StandardProperties;
 
-inoop!(ITimestamp, Timestamp);
+#[derive(Debug, Clone)]
+pub(crate) struct ITimestamp {
+    pub(crate) source: String,
+    pub(crate) post_blank: organic::types::PostBlank,
+}
+
+intermediate!(
+    ITimestamp,
+    &'orig organic::types::Timestamp<'parse>,
+    original,
+    _intermediate_context,
+    {
+        Ok(ITimestamp {
+            source: coalesce_whitespace(original.source).into_owned(),
+            post_blank: original.get_post_blank(),
+        })
+    }
+);