Round value placed in datatime attribute

Fixes #1

src/main.rs

@@ -1,5 +1,5 @@
 use jiff::tz::TimeZone;
-use jiff::Timestamp;
+use jiff::{Timestamp, Unit};
 use pleroma::Activities;
 use std::ffi::OsStr;
 use std::sync::OnceLock;
@@ -227,7 +227,7 @@ markup::define! {
 
             div[class="activity-content"] {
                 a[href=MAPPINGS.get().unwrap().get(&activity.id).and_then(|url| url.as_ref().map(|url| url.path()))] {
-                    time[datetime=&activity.published] { @activity.human_published() }
+                    time[datetime=&activity.datetime()] { @activity.human_published() }
                 }
 
                 @if let Some(in_reply_to) = &activity.in_reply_to {
@@ -285,6 +285,17 @@ impl pleroma::Activity {
 
         published.strftime("%d %b %Y").to_string()
     }
+
+    /// datetime for `time` element
+    fn datetime(&self) -> String {
+        let published = self
+            .published
+            .parse::<Timestamp>()
+            .map(|ts| ts.round(Unit::Second).expect("rounding to succeeed"))
+            .expect("invalid published value");
+
+        published.to_string()
+    }
 }
 
 impl pleroma::Actor {