diff --git a/src/chrono_04.rs b/src/chrono_04.rs
index be9a741..cbfb821 100644
--- a/src/chrono_04.rs
+++ b/src/chrono_04.rs
@@ -1,4 +1,4 @@
-use chrono_04::{DateTime, NaiveDateTime, TimeZone};
+use chrono_04::{DateTime, NaiveDateTime, TimeZone, NaiveDate};
 
 use crate::{Normalizable, RangeBound, BoundSided};
 
@@ -20,4 +20,6 @@ impl Normalizable for NaiveDateTime
     {
         bound
     }
-}
\ No newline at end of file
+}
+
+bounded_normalizable!(NaiveDate, ::chrono_04::Duration::days(1));
diff --git a/src/impls.rs b/src/impls.rs
index 19615e1..92d3ff2 100644
--- a/src/impls.rs
+++ b/src/impls.rs
@@ -118,7 +118,7 @@ mod test {
     use postgres::{Client, NoTls};
     use postgres::types::{FromSql, ToSql};
     #[cfg(feature = "with-chrono-0_4")]
-    use chrono_04::{TimeZone, Utc, Duration};
+    use chrono_04::{NaiveDate, NaiveTime, NaiveDateTime, TimeZone, Utc, Duration};
 
     macro_rules! test_range {
         ($name:expr, $t:ty, $low:expr, $low_str:expr, $high:expr, $high_str:expr) => ({
@@ -144,7 +144,7 @@ mod test {
 
     fn test_type<T, S>(sql_type: &str, checks: &[(T, S)])
     where for<'a>
-        T: Sync + PartialEq + FromSql<'a> + ToSql,
+        T: Sync + PartialEq + FromSql<'a> + ToSql + fmt::Debug,
         S: fmt::Display
     {
         let mut conn = Client::connect("postgres://postgres@localhost", NoTls).unwrap();
@@ -152,11 +152,11 @@ mod test {
             let stmt = conn.prepare(&*format!("SELECT {}::{}", *repr, sql_type))
                 .unwrap();
             let result = conn.query(&stmt, &[]).unwrap().iter().next().unwrap().get(0);
-            assert!(val == &result);
+            assert_eq!(val, &result, "'SELECT {repr}::{sql_type}'");
 
             let stmt = conn.prepare(&*format!("SELECT $1::{}", sql_type)).unwrap();
             let result = conn.query(&stmt, &[val]).unwrap().iter().next().unwrap().get(0);
-            assert!(val == &result);
+            assert_eq!(val, &result, "'SELECT $1::{sql_type}'");
         }
     }
 
@@ -173,16 +173,28 @@ mod test {
     #[test]
     #[cfg(feature = "with-chrono-0_4")]
     fn test_tsrange_params() {
-        let low = Utc.timestamp(0, 0);
+        let d = NaiveDate::from_ymd_opt(2015, 6, 3).unwrap();
+        let t = NaiveTime::from_hms_milli_opt(12, 34, 56, 789).unwrap();
+
+        let low = NaiveDateTime::new(d, t);
         let high = low + Duration::days(10);
-        test_range!("TSRANGE", NaiveDateTime, low.naive_utc(), "1970-01-01", high.naive_utc(), "1970-01-11");
+        test_range!("TSRANGE", NaiveDateTime, low, "2015-06-03T12:34:56.789", high, "2015-06-13T12:34:56.789");
     }
 
     #[test]
     #[cfg(feature = "with-chrono-0_4")]
     fn test_tstzrange_params() {
-        let low = Utc.timestamp(0, 0);
+        let low = Utc.with_ymd_and_hms(2014, 7, 8, 9, 10, 11).unwrap();
+        let high = low + Duration::days(10);
+        test_range!("TSTZRANGE", DateTime<_>, low, "2014-07-08T09:10:11Z", high, "2014-07-18T09:10:11Z");
+    }
+
+
+    #[test]
+    #[cfg(feature = "with-chrono-0_4")]
+    fn test_daterange_params() {
+        let low = NaiveDate::from_ymd_opt(2015, 6, 4).unwrap();
         let high = low + Duration::days(10);
-        test_range!("TSTZRANGE", DateTime<Utc>, low, "1970-01-01", high, "1970-01-11");
+        test_range!("DATERANGE", NaiveDate, low, "2015-06-04", high, "2015-06-14");
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index a1d68a5..4bbf283 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,9 +5,6 @@
 #[macro_use(to_sql_checked)]
 extern crate postgres_types;
 
-#[cfg(feature = "with-chrono-0_4")]
-mod chrono_04;
-
 use std::cmp::Ordering;
 use std::fmt;
 use std::i32;
@@ -106,8 +103,6 @@ macro_rules! range {
     )
 }
 
-mod impls;
-
 /// A trait that normalizes a range bound for a type
 pub trait Normalizable: Sized {
     /// Given a range bound, returns the normalized version of that bound. For
@@ -124,17 +119,19 @@ pub trait Normalizable: Sized {
 }
 
 macro_rules! bounded_normalizable {
-    ($t:ident) => (
+    ($t:ident, $delta:expr) => (
         impl Normalizable for $t {
             fn normalize<S>(bound: RangeBound<S, $t>) -> RangeBound<S, $t> where S: BoundSided {
+                use $crate::{BoundSide::*, BoundType::*};
+
                 match (<S as BoundSided>::side(), bound.type_) {
                     (Upper, Inclusive) => {
                         assert!(bound.value != $t::MAX);
-                        RangeBound::new(bound.value + 1, Exclusive)
+                        RangeBound::new(bound.value + ($delta), Exclusive)
                     }
                     (Lower, Exclusive) => {
                         assert!(bound.value != $t::MAX);
-                        RangeBound::new(bound.value + 1, Inclusive)
+                        RangeBound::new(bound.value + ($delta), Inclusive)
                     }
                     _ => bound
                 }
@@ -143,8 +140,13 @@ macro_rules! bounded_normalizable {
     )
 }
 
-bounded_normalizable!(i32);
-bounded_normalizable!(i64);
+bounded_normalizable!(i32, 1);
+bounded_normalizable!(i64, 1);
+
+mod impls;
+
+#[cfg(feature = "with-chrono-0_4")]
+mod chrono_04;
 
 /// The possible sides of a bound.
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]