Webapp

src/timestamp.rs

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+use serde::Serialize;
+use std::time::{SystemTime, UNIX_EPOCH};
+
+/// Wall-clock instant stored as nanoseconds since the Unix epoch.
+///
+/// The README's data model sketches this field as `Instant`, but `Instant` has no
+/// epoch and can't be serialized to the frontend, so wall-clock time is stored here
+/// instead.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize)]
+pub struct Timestamp(i64);
+
+impl Timestamp {
+    pub fn now() -> Self {
+        let nanos = SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .expect("system clock is before the Unix epoch")
+            .as_nanos() as i64;
+        Timestamp(nanos)
+    }
+
+    #[allow(dead_code)]
+    pub fn from_millis(millis: i64) -> Self {
+        Timestamp(millis * 1_000_000)
+    }
+
+    pub fn as_millis(&self) -> i64 {
+        self.0 / 1_000_000
+    }
+}