Prepublish only sets the publish time if one was not already specified

src/bin/prepublish/main.rs

@@ -29,7 +29,9 @@ fn main() {
             },
         };
 
-        *source.header_mut().published_mut() = Utc::now();
+        if source.header().published().is_none() {
+            *source.header_mut().published_mut() = Some(Utc::now());
+        }
 
         if let Err(err) = fs::write(&path, source.to_string()) {
             eprintln!("failed to write {}: {}", path.to_string_lossy(), err);

src/lib/post/header.rs

@@ -13,8 +13,7 @@ pub struct Header {
     pub(super) author: ShString22,
     #[serde(default)]
     pub(super) tags: Vec<ShString22>,
-    #[serde(default = "crate::time::unix_epoch")]
+    pub(super) published: Option<DateTime<Utc>>,
-    pub(super) published: DateTime<Utc>,
 }
 
 impl Header {
@@ -68,13 +67,13 @@ impl Header {
 
     #[inline]
     #[must_use]
-    pub fn published(&self) -> DateTime<Utc> {
+    pub fn published(&self) -> Option<DateTime<Utc>> {
         self.published
     }
 
     #[inline]
     #[must_use]
-    pub fn published_mut(&mut self) -> &mut DateTime<Utc> {
+    pub fn published_mut(&mut self) -> &mut Option<DateTime<Utc>> {
         &mut self.published
     }
 }

src/lib/post/rendered_post.rs

@@ -16,7 +16,7 @@ pub struct RenderedPost {
     uuid: Uuid,
     id: Id,
     header: Header,
-    updated: DateTime<Utc>,
+    updated: Option<DateTime<Utc>>,
     html: Markup,
 }
 
@@ -50,7 +50,7 @@ impl RenderedPost {
             uuid,
             id,
             header: source.header,
-            updated: updated.unwrap_or_else(unix_epoch),
+            updated,
             html: render_markdown(code_renderer, &source.markdown), 
         })
     }
@@ -101,12 +101,14 @@ impl RenderedPost {
     #[must_use]
     pub fn published(&self) -> DateTime<Utc> {
         self.header.published()
+            .unwrap_or_else(unix_epoch)
     }
 
     #[inline]
     #[must_use]
     pub fn updated(&self) -> DateTime<Utc> {
         self.updated
+            .unwrap_or_else(unix_epoch)
     }
 
     #[inline]