encap dep:chrono in time utils

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/Cargo.toml

@@ -49,6 +49,7 @@ sentry_telemetry = []
 argon2.workspace = true
 axum.workspace = true
 bytes.workspace = true
+chrono.workspace = true
 either.workspace = true
 figment.workspace = true
 http-body-util.workspace = true

src/core/utils/time.rs

@@ -9,3 +9,12 @@ pub fn millis_since_unix_epoch() -> u64 {
 		.expect("time is valid")
 		.as_millis() as u64
 }
+
+#[must_use]
+pub fn rfc2822_from_seconds(epoch: i64) -> String {
+	use chrono::{DateTime, Utc};
+
+	DateTime::<Utc>::from_timestamp(epoch, 0)
+		.unwrap_or_default()
+		.to_rfc2822()
+}