1 files changed, 100 insertions, 0 deletions
diff --git a/src/offset/utc.rs b/src/offset/utc.rs
new file mode 100644
index 0000000..aec6667
--- /dev/null
+++ b/src/offset/utc.rs
@@ -0,0 +1,100 @@
+// This is a part of Chrono.
+// See README.md and LICENSE.txt for details.
+
+//! The UTC (Coordinated Universal Time) time zone.
+
+use core::fmt;
+
+use super::{FixedOffset, LocalResult, Offset, TimeZone};
+use naive::{NaiveDate, NaiveDateTime};
+#[cfg(all(
+    feature = "clock",
+    not(all(target_arch = "wasm32", not(target_os = "wasi"), feature = "wasmbind"))
+))]
+use std::time::{SystemTime, UNIX_EPOCH};
+#[cfg(feature = "clock")]
+use {Date, DateTime};
+
+/// The UTC time zone. This is the most efficient time zone when you don't need the local time.
+/// It is also used as an offset (which is also a dummy type).
+///
+/// Using the [`TimeZone`](./trait.TimeZone.html) methods
+/// on the UTC struct is the preferred way to construct `DateTime<Utc>`
+/// instances.
+///
+/// # Example
+///
+/// ~~~~
+/// use chrono::{DateTime, TimeZone, NaiveDateTime, Utc};
+///
+/// let dt = DateTime::<Utc>::from_utc(NaiveDateTime::from_timestamp(61, 0), Utc);
+///
+/// assert_eq!(Utc.timestamp(61, 0), dt);
+/// assert_eq!(Utc.ymd(1970, 1, 1).and_hms(0, 1, 1), dt);
+/// ~~~~
+#[derive(Copy, Clone, PartialEq, Eq)]
+pub struct Utc;
+
+#[cfg(feature = "clock")]
+impl Utc {
+    /// Returns a `Date` which corresponds to the current date.
+    pub fn today() -> Date<Utc> {
+        Utc::now().date()
+    }
+
+    /// Returns a `DateTime` which corresponds to the current date.
+    #[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"), feature = "wasmbind")))]
+    pub fn now() -> DateTime<Utc> {
+        let now =
+            SystemTime::now().duration_since(UNIX_EPOCH).expect("system time before Unix epoch");
+        let naive = NaiveDateTime::from_timestamp(now.as_secs() as i64, now.subsec_nanos() as u32);
+        DateTime::from_utc(naive, Utc)
+    }
+
+    /// Returns a `DateTime` which corresponds to the current date.
+    #[cfg(all(target_arch = "wasm32", not(target_os = "wasi"), feature = "wasmbind"))]
+    pub fn now() -> DateTime<Utc> {
+        let now = js_sys::Date::new_0();
+        DateTime::<Utc>::from(now)
+    }
+}
+
+impl TimeZone for Utc {
+    type Offset = Utc;
+
+    fn from_offset(_state: &Utc) -> Utc {
+        Utc
+    }
+
+    fn offset_from_local_date(&self, _local: &NaiveDate) -> LocalResult<Utc> {
+        LocalResult::Single(Utc)
+    }
+    fn offset_from_local_datetime(&self, _local: &NaiveDateTime) -> LocalResult<Utc> {
+        LocalResult::Single(Utc)
+    }
+
+    fn offset_from_utc_date(&self, _utc: &NaiveDate) -> Utc {
+        Utc
+    }
+    fn offset_from_utc_datetime(&self, _utc: &NaiveDateTime) -> Utc {
+        Utc
+    }
+}
+
+impl Offset for Utc {
+    fn fix(&self) -> FixedOffset {
+        FixedOffset::east(0)
+    }
+}
+
+impl fmt::Debug for Utc {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "Z")
+    }
+}
+
+impl fmt::Display for Utc {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "UTC")
+    }
+}