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diff --git a/src/sys.rs b/src/sys.rs
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+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Platform wrappers for converting UTC times to and from the local time zone.
+//!
+//! This code was rescued from v0.1 of the time crate, which is no longer
+//! maintained. It has been substantially stripped down to the bare minimum
+//! required by chrono.
+
+use std::time::{SystemTime, UNIX_EPOCH};
+
+#[cfg(any(target_arch = "wasm32", target_env = "sgx"))]
+#[path = "sys/stub.rs"]
+mod inner;
+
+#[cfg(unix)]
+#[path = "sys/unix.rs"]
+mod inner;
+
+#[cfg(windows)]
+#[path = "sys/windows.rs"]
+mod inner;
+
+/// A record specifying a time value in seconds and nanoseconds, where
+/// nanoseconds represent the offset from the given second.
+///
+/// For example a timespec of 1.2 seconds after the beginning of the epoch would
+/// be represented as {sec: 1, nsec: 200000000}.
+pub struct Timespec {
+    pub sec: i64,
+    pub nsec: i32,
+}
+
+impl Timespec {
+    /// Constructs a timespec representing the current time in UTC.
+    pub fn now() -> Timespec {
+        let st =
+            SystemTime::now().duration_since(UNIX_EPOCH).expect("system time before Unix epoch");
+        Timespec { sec: st.as_secs() as i64, nsec: st.subsec_nanos() as i32 }
+    }
+
+    /// Converts this timespec into the system's local time.
+    pub fn local(self) -> Tm {
+        let mut tm = Tm {
+            tm_sec: 0,
+            tm_min: 0,
+            tm_hour: 0,
+            tm_mday: 0,
+            tm_mon: 0,
+            tm_year: 0,
+            tm_wday: 0,
+            tm_yday: 0,
+            tm_isdst: 0,
+            tm_utcoff: 0,
+            tm_nsec: 0,
+        };
+        inner::time_to_local_tm(self.sec, &mut tm);
+        tm.tm_nsec = self.nsec;
+        tm
+    }
+}
+
+/// Holds a calendar date and time broken down into its components (year, month,
+/// day, and so on), also called a broken-down time value.
+// FIXME: use c_int instead of i32?
+#[cfg(feature = "clock")]
+#[repr(C)]
+pub struct Tm {
+    /// Seconds after the minute - [0, 60]
+    pub tm_sec: i32,
+
+    /// Minutes after the hour - [0, 59]
+    pub tm_min: i32,
+
+    /// Hours after midnight - [0, 23]
+    pub tm_hour: i32,
+
+    /// Day of the month - [1, 31]
+    pub tm_mday: i32,
+
+    /// Months since January - [0, 11]
+    pub tm_mon: i32,
+
+    /// Years since 1900
+    pub tm_year: i32,
+
+    /// Days since Sunday - [0, 6]. 0 = Sunday, 1 = Monday, ..., 6 = Saturday.
+    pub tm_wday: i32,
+
+    /// Days since January 1 - [0, 365]
+    pub tm_yday: i32,
+
+    /// Daylight Saving Time flag.
+    ///
+    /// This value is positive if Daylight Saving Time is in effect, zero if
+    /// Daylight Saving Time is not in effect, and negative if this information
+    /// is not available.
+    pub tm_isdst: i32,
+
+    /// Identifies the time zone that was used to compute this broken-down time
+    /// value, including any adjustment for Daylight Saving Time. This is the
+    /// number of seconds east of UTC. For example, for U.S. Pacific Daylight
+    /// Time, the value is `-7*60*60 = -25200`.
+    pub tm_utcoff: i32,
+
+    /// Nanoseconds after the second - [0, 10<sup>9</sup> - 1]
+    pub tm_nsec: i32,
+}
+
+impl Tm {
+    /// Convert time to the seconds from January 1, 1970
+    pub fn to_timespec(&self) -> Timespec {
+        let sec = match self.tm_utcoff {
+            0 => inner::utc_tm_to_time(self),
+            _ => inner::local_tm_to_time(self),
+        };
+        Timespec { sec: sec, nsec: self.tm_nsec }
+    }
+}