diff --git a/src/date.rs b/src/date.rs
index 7acdde7..dba7dd0 100644
--- a/src/date.rs
+++ b/src/date.rs
@@ -224,6 +224,7 @@ impl<Tz: TimeZone> Date<Tz> {
     ///
     /// This does not overflow or underflow at all,
     /// as all possible output fits in the range of `Duration`.
+    #[cfg_attr(feature = "cargo-clippy", allow(needless_pass_by_value))]
     #[inline]
     pub fn signed_duration_since<Tz2: TimeZone>(self, rhs: Date<Tz2>) -> OldDuration {
         self.date.signed_duration_since(rhs.date)
diff --git a/src/datetime.rs b/src/datetime.rs
index f5ca30c..6500ee7 100644
--- a/src/datetime.rs
+++ b/src/datetime.rs
@@ -159,6 +159,7 @@ impl<Tz: TimeZone> DateTime<Tz> {
 
     /// Subtracts another `DateTime` from the current date and time.
     /// This does not overflow or underflow at all.
+    #[cfg_attr(feature = "cargo-clippy", allow(needless_pass_by_value))]
     #[inline]
     pub fn signed_duration_since<Tz2: TimeZone>(self, rhs: DateTime<Tz2>) -> OldDuration {
         self.datetime.signed_duration_since(rhs.datetime)
diff --git a/src/lib.rs b/src/lib.rs
index c20ff58..4e37d30 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -387,6 +387,12 @@
 #![deny(missing_docs)]
 #![deny(missing_debug_implementations)]
 
+// The explicit 'static lifetimes are still needed for rustc 1.13-16
+// backward compatibility, and this appeases clippy. If minimum rustc
+// becomes 1.17, should be able to remove this, those 'static lifetimes,
+// and use `static` in a lot of places `const` is used now.
+#![cfg_attr(feature = "cargo-clippy", allow(const_static_lifetime))]
+
 extern crate time as oldtime;
 extern crate num;
 #[cfg(feature = "rustc-serialize")]