diff --git a/postgres-shared/Cargo.toml b/postgres-shared/Cargo.toml
index ee9be273..c6e7b183 100644
--- a/postgres-shared/Cargo.toml
+++ b/postgres-shared/Cargo.toml
@@ -22,7 +22,7 @@ phf = "=0.7.21"
 postgres-protocol = "0.2"
 
 bit-vec = { version = "0.4", optional = true }
-chrono = { version = "0.2.14", optional = true }
+chrono = { version = "0.3", optional = true }
 eui48 = { version = "0.1", optional = true }
 rustc-serialize = { version = "0.3", optional = true }
 serde_json = { version = ">= 0.6, < 0.10", optional = true }
diff --git a/postgres-shared/src/types/chrono.rs b/postgres-shared/src/types/chrono.rs
index 60d8d15e..1ce73956 100644
--- a/postgres-shared/src/types/chrono.rs
+++ b/postgres-shared/src/types/chrono.rs
@@ -29,7 +29,7 @@ impl ToSql for NaiveDateTime {
               w: &mut Vec<u8>,
               _: &SessionInfo)
               -> Result<IsNull, Box<Error + Sync + Send>> {
-        let time = match (*self - base()).num_microseconds() {
+        let time = match self.signed_duration_since(base()).num_microseconds() {
             Some(time) => time,
             None => return Err("value too large to transmit".into()),
         };
@@ -134,7 +134,7 @@ impl ToSql for NaiveDate {
               w: &mut Vec<u8>,
               _: &SessionInfo)
               -> Result<IsNull, Box<Error + Sync + Send>> {
-        let jd = (*self - base().date()).num_days();
+        let jd = self.signed_duration_since(base().date()).num_days();
         if jd > i32::max_value() as i64 || jd < i32::min_value() as i64 {
             return Err("value too large to transmit".into());
         }
@@ -165,7 +165,7 @@ impl ToSql for NaiveTime {
               w: &mut Vec<u8>,
               _: &SessionInfo)
               -> Result<IsNull, Box<Error + Sync + Send>> {
-        let delta = *self - NaiveTime::from_hms(0, 0, 0);
+        let delta = self.signed_duration_since(NaiveTime::from_hms(0, 0, 0));
         let time = match delta.num_microseconds() {
             Some(time) => time,
             None => return Err("value too large to transmit".into()),
diff --git a/postgres/Cargo.toml b/postgres/Cargo.toml
index 2dddac12..3c682a6f 100644
--- a/postgres/Cargo.toml
+++ b/postgres/Cargo.toml
@@ -55,7 +55,7 @@ postgres-shared = { version = "0.1", path = "../postgres-shared" }
 url = "1.0"
 
 bit-vec = "0.4"
-chrono = "0.2.14"
+chrono = "0.3"
 eui48 = "0.1"
 rustc-serialize = "0.3"
 serde_json = ">= 0.6, < 0.10"