diff --git a/libimagentrydatetime/Cargo.toml b/libimagentrydatetime/Cargo.toml
index ec3b281d..2b311de7 100644
--- a/libimagentrydatetime/Cargo.toml
+++ b/libimagentrydatetime/Cargo.toml
@@ -19,6 +19,9 @@ toml-query = "0.1"
 lazy_static = "0.2"
 toml = "0.4"
 
+[dev-dependencies]
+is-match = "0.1"
+
 [dependencies.libimagerror]
 path = "../libimagerror"
 
diff --git a/libimagentrydatetime/src/lib.rs b/libimagentrydatetime/src/lib.rs
index 0e1a4006..fb0d73fa 100644
--- a/libimagentrydatetime/src/lib.rs
+++ b/libimagentrydatetime/src/lib.rs
@@ -26,6 +26,9 @@ extern crate toml;
 extern crate libimagstore;
 extern crate libimagutil;
 
+#[cfg(test)]
+#[macro_use] extern crate is_match;
+
 pub mod datepath;
 pub mod datetime;
 pub mod error;
diff --git a/libimagentrydatetime/src/range.rs b/libimagentrydatetime/src/range.rs
index 017ee2fc..3a94faff 100644
--- a/libimagentrydatetime/src/range.rs
+++ b/libimagentrydatetime/src/range.rs
@@ -66,3 +66,46 @@ impl DateTimeRange {
 
 }
 
+#[cfg(test)]
+mod tests {
+
+    use chrono::naive::datetime::NaiveDateTime;
+    use chrono::naive::date::NaiveDate;
+    use chrono::naive::time::NaiveTime;
+
+    use super::DateTimeRange;
+
+    #[test]
+    fn test_new_returns_error_if_start_after_end_date() {
+        let start = NaiveDateTime::new(
+            NaiveDate::from_ymd(2000, 02, 02),
+            NaiveTime::from_hms(12, 00, 02)
+        );
+
+        let end = NaiveDateTime::new(
+            NaiveDate::from_ymd(2000, 02, 02),
+            NaiveTime::from_hms(12, 00, 01)
+        );
+
+        let res = DateTimeRange::new(start, end);
+
+        assert!(res.is_err());
+    }
+
+    #[test]
+    fn test_new_returns_ok_if_start_is_before_end() {
+        let start = NaiveDateTime::new(
+            NaiveDate::from_ymd(2000, 02, 02),
+            NaiveTime::from_hms(12, 00, 01)
+        );
+
+        let end = NaiveDateTime::new(
+            NaiveDate::from_ymd(2000, 02, 02),
+            NaiveTime::from_hms(12, 00, 02)
+        );
+
+        let res = DateTimeRange::new(start, end);
+
+        assert!(res.is_ok());
+    }
+}