diff --git a/src/free_api_v25/current/mod.rs b/src/free_api_v25/current/mod.rs
index d37d286..8b80684 100644
--- a/src/free_api_v25/current/mod.rs
+++ b/src/free_api_v25/current/mod.rs
@@ -21,5 +21,6 @@ pub mod clouds;
 pub mod coord;
 pub mod main;
 pub mod precipitation;
+pub mod sys;
 pub mod weather;
 pub mod wind;
diff --git a/src/free_api_v25/current/sys.rs b/src/free_api_v25/current/sys.rs
new file mode 100644
index 0000000..ddf8bb2
--- /dev/null
+++ b/src/free_api_v25/current/sys.rs
@@ -0,0 +1,54 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+
+/// System and location information
+///
+/// Contains country, sunrise/sunset times, and internal API parameters.
+#[derive(Debug, Clone, Deserialize, Serialize, Default, PartialEq)]
+pub struct Sys {
+    /// Internal parameter
+    #[serde(default)]
+    pub r#type: Option<u8>,
+
+    /// Internal parameter
+    #[serde(default)]
+    pub id: Option<u32>,
+
+    /// Country code (ISO 3166-1 alpha-2, e.g. "GB", "JP")
+    #[serde(default)]
+    pub country: Option<String>,
+
+    /// Sunrise time (UTC Unix timestamp)
+    #[serde(with = "chrono::serde::ts_seconds_option")]
+    pub sunrise: Option<DateTime<Utc>>,
+
+    /// Sunset time (UTC Unix timestamp)
+    #[serde(with = "chrono::serde::ts_seconds_option")]
+    pub sunset: Option<DateTime<Utc>>,
+
+    /// Internal parameter (often used for error messages)
+    #[serde(default)]
+    pub message: Option<f64>,
+}
+
+impl Sys {
+    /// Returns true if it's currently daytime at the location
+    ///
+    /// Compares current UTC time with sunrise and sunset times.
+    #[must_use]
+    pub fn is_daytime(&self) -> Option<bool> {
+        let now = Utc::now();
+        match (self.sunrise, self.sunset) {
+            (Some(sunrise), Some(sunset)) => Some(now >= sunrise && now <= sunset),
+            _ => None,
+        }
+    }
+
+    /// Returns the duration of daylight (sunset - sunrise)
+    ///
+    /// Returns `None` if either sunrise or sunset data is missing.
+    #[must_use]
+    pub fn daylight_duration(&self) -> Option<chrono::Duration> {
+        Some(self.sunset? - self.sunrise?)
+    }
+}