first pass of merging in warp (doesn't build)

crates/galaxy_cli/src/date_time.rs

@@ -0,0 +1,8 @@
+use chrono::{DateTime, Utc};
+
+/// Parse an RFC 3339 timestamp into a UTC `DateTime`.
+pub(crate) fn parse_rfc3339(s: &str) -> Result<DateTime<Utc>, String> {
+    DateTime::parse_from_rfc3339(s)
+        .map(|dt| dt.with_timezone(&Utc))
+        .map_err(|e| format!("invalid RFC 3339 timestamp '{s}': {e}"))
+}