diff --git a/src/timeparse.rs b/src/timeparse.rs
index 26b3e00..6c3983d 100644
--- a/src/timeparse.rs
+++ b/src/timeparse.rs
@@ -60,11 +60,13 @@ pub fn parse_time(input: &str) -> Result<DateTime<Utc>> {
                 NUMBER_VALUES[&caps["hcten"]] + NUMBER_VALUES[&caps["hcdigit"]]
             } else if let Some(m) = caps.name("htextualnum") {
                 m.as_str().parse().unwrap()
+            } else if let Some(_) = caps.name("half") {
+                0.5
             } else {
                 unreachable!()
             }
         } else {
-            0
+            0.
         };
 
         let minutes = if caps.name("minute").is_some() {
@@ -82,11 +84,11 @@ pub fn parse_time(input: &str) -> Result<DateTime<Utc>> {
                 unreachable!()
             }
         } else {
-            0
+            0.
         };
 
         return Ok(Utc.from_utc_datetime(
-            &(Local::now() - Duration::minutes(hours * 60 + minutes)).naive_utc()
+            &(Local::now() - Duration::minutes((hours * 60. + minutes) as i64)).naive_utc()
         ));
     }
 
@@ -208,13 +210,13 @@ mod tests {
     }
 
     fn time_diff(t1: DateTime<Utc>, t2: DateTime<Local>) {
-        let diff = (t1 - dbg!(Utc.from_utc_datetime(&dbg!(t2.naive_utc())))).num_seconds();
+        let diff = dbg!(dbg!(t1) - dbg!(Utc.from_utc_datetime(&t2.naive_utc()))).num_seconds().abs();
 
         assert!(diff < 1, "too different: {} s", diff);
     }
 
     #[test]
-    fn parse_human_minute() {
+    fn parse_human_times() {
         // hours
         time_diff(parse_time("an hour ago").unwrap(), Local::now() - Duration::hours(1));
         time_diff(parse_time("two hours ago").unwrap(), Local::now() - Duration::hours(2));
@@ -229,10 +231,11 @@ mod tests {
         time_diff(parse_time("forty one minutes ago").unwrap(), Local::now() - Duration::minutes(41));
         time_diff(parse_time("1 minute ago").unwrap(), Local::now() - Duration::minutes(1));
         time_diff(parse_time("23 minutes ago").unwrap(), Local::now() - Duration::minutes(23));
+        time_diff(parse_time("half an hour ago").unwrap(), dbg!(Local::now() - Duration::minutes(30)));
 
         // mixed
-        time_diff(parse_time("an hour 10 minutes ago").unwrap(), Local::now() - Duration::minutes(1));
-        time_diff(parse_time("2 hours five minutes ago").unwrap(), Local::now() - Duration::minutes(1));
+        time_diff(parse_time("an hour 10 minutes ago").unwrap(), Local::now() - Duration::minutes(70));
+        time_diff(parse_time("2 hours five minutes ago").unwrap(), Local::now() - Duration::minutes(125));
         time_diff(parse_time("an hour 12 minutes ago").unwrap(), Local::now() - Duration::minutes(1 * 60 + 12));
 
         // abbreviated
diff --git a/src/timeparse/strings.rs b/src/timeparse/strings.rs
index a07aeb0..7e2bbaa 100644
--- a/src/timeparse/strings.rs
+++ b/src/timeparse/strings.rs
@@ -7,6 +7,7 @@ lazy_static! {
     pub static ref HUMAN_REGEX: Regex = Regex::new(r"(?xi)
 (?P<hour>
     (?P<hnum>
+        (?P<half>half(\s+)a(n)?)|
         (?P<hcase>a|an|eleven|twelve|thirteen|fourteen|fifteen|sixteen|seventeen|eighteen|nineteen)|
         (?P<hdigit>one|two|three|four|five|six|seven|eight|nine)|
         (?P<hten>ten|twenty|thirty|forty|fifty|sixty|seventy|eighty|ninety)|
@@ -63,39 +64,39 @@ lazy_static! {
         )? # the offset, optional
     ").unwrap();
 
-    pub static ref NUMBER_VALUES: HashMap<&'static str, i64> = {
+    pub static ref NUMBER_VALUES: HashMap<&'static str, f64> = {
         vec![
-            ("a", 1),
-            ("an", 1),
-            ("ten", 10),
-            ("eleven", 11),
-            ("twelve", 12),
-            ("thirteen", 13),
-            ("fourteen", 14),
-            ("fifteen", 15),
-            ("sixteen", 16),
-            ("seventeen", 17),
-            ("eighteen", 18),
-            ("nineteen", 19),
+            ("a", 1.),
+            ("an", 1.),
+            ("ten", 10.),
+            ("eleven", 11.),
+            ("twelve", 12.),
+            ("thirteen", 13.),
+            ("fourteen", 14.),
+            ("fifteen", 15.),
+            ("sixteen", 16.),
+            ("seventeen", 17.),
+            ("eighteen", 18.),
+            ("nineteen", 19.),
 
-            ("one", 1),
-            ("two", 2),
-            ("three", 3),
-            ("four", 4),
-            ("five", 5),
-            ("six", 6),
-            ("seven", 7),
-            ("eight", 8),
-            ("nine", 9),
+            ("one", 1.),
+            ("two", 2.),
+            ("three", 3.),
+            ("four", 4.),
+            ("five", 5.),
+            ("six", 6.),
+            ("seven", 7.),
+            ("eight", 8.),
+            ("nine", 9.),
 
-            ("twenty", 20),
-            ("thirty", 30),
-            ("forty", 40),
-            ("fifty", 50),
-            ("sixty", 60),
-            ("seventy", 70),
-            ("eighty", 80),
-            ("ninety", 90),
+            ("twenty", 20.),
+            ("thirty", 30.),
+            ("forty", 40.),
+            ("fifty", 50.),
+            ("sixty", 60.),
+            ("seventy", 70.),
+            ("eighty", 80.),
+            ("ninety", 90.),
         ].into_iter().collect()
     };
 }