diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 72b31f2..3658001 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -7,14 +7,14 @@ on:
 jobs:
   unit-tests:
     runs-on: ubuntu-latest
-    container: rust:1.59-alpine
+    container: rust:1.70-alpine
     steps:
       - uses: actions/checkout@v2
       - run: apk add alpine-sdk
       - run: cargo test --all-features --workspace
   lint:
     runs-on: ubuntu-latest
-    container: rust:1.59-alpine
+    container: rust:1.70-alpine
     steps:
       - uses: actions/checkout@v2
       - run: rustup toolchain install nightly
@@ -22,7 +22,7 @@ jobs:
       - run: cargo +nightly fmt -- --check
   docs:
     runs-on: ubuntu-latest
-    container: rust:1.59-alpine
+    container: rust:1.70-alpine
     steps:
       - uses: actions/checkout@v2
       - run: apk add alpine-sdk
diff --git a/Cargo.toml b/Cargo.toml
index 7eb1817..ffb6dab 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "unix-ts"
-version = "0.4.1"
+version = "0.6.0"
 edition = "2021"
 authors = [
   "Luke Sneeringer <luke@sneeringer.com>"
@@ -24,7 +24,7 @@ chrono = { version = "0.4", optional = true }
 unix-ts-macros = { path = "macros", version = "0.4" }
 
 [dev-dependencies]
-chrono-tz = "0.6"
+chrono-tz = "^0.8.3"
 assert2 = "0.3"
 
 [build-dependencies]
diff --git a/build.rs b/build.rs
index 04b2406..9313a7d 100644
--- a/build.rs
+++ b/build.rs
@@ -3,7 +3,7 @@ use std::error::Error;
 use std::fs;
 use std::path::PathBuf;
 
-const CRATE_NAME: &str = "plutus";
+const CRATE_NAME: &str = "unix-ts";
 
 fn main() -> Result<(), Box<dyn Error>> {
   println!("cargo:rerun-if-changed=README.md");
diff --git a/macros/Cargo.toml b/macros/Cargo.toml
index da05020..87dbdc8 100644
--- a/macros/Cargo.toml
+++ b/macros/Cargo.toml
@@ -20,7 +20,7 @@ exclude = [
 proc-macro = true
 
 [dev-dependencies]
-unix-ts = { path = "..", version = "0.4.0" }
+unix-ts = { path = "..", version = "0.6.0" }
 
 [build-dependencies]
 readme-rustdocifier = "0.1"
diff --git a/macros/src/lib.rs b/macros/src/lib.rs
index 70fa90b..d7aa5c3 100644
--- a/macros/src/lib.rs
+++ b/macros/src/lib.rs
@@ -25,7 +25,7 @@ use proc_macro::TokenStream;
 #[proc_macro]
 pub fn ts(input: TokenStream) -> TokenStream {
   let mut src = input.to_string().trim_start().trim_end().to_owned();
-  if src.len() == 0 {
+  if src.is_empty() {
     panic!("No input to ts! macro.");
   }
 
@@ -73,12 +73,12 @@ pub fn ts(input: TokenStream) -> TokenStream {
   }
 
   // Return the new timestamp.
-  return format!(
+  format!(
     "::unix_ts::Timestamp::new({}{}, {})",
     if neg { '-' } else { ' ' },
     seconds,
-    nanos[0..9].to_string(),
+    &nanos[0..9],
   )
   .parse()
-  .unwrap();
+  .expect("Not a number.")
 }
diff --git a/src/chrono.rs b/src/chrono.rs
index 0481223..6475c5f 100644
--- a/src/chrono.rs
+++ b/src/chrono.rs
@@ -1,9 +1,8 @@
-extern crate chrono;
-
 use chrono::DateTime;
 use chrono::NaiveDateTime;
 use chrono::TimeZone;
 use chrono::Utc;
+use std::fmt::Display;
 
 use crate::timestamp::Timestamp;
 
diff --git a/src/display.rs b/src/display.rs
new file mode 100644
index 0000000..d60d9cb
--- /dev/null
+++ b/src/display.rs
@@ -0,0 +1,26 @@
+use std::fmt::Display;
+
+use crate::Timestamp;
+
+impl Display for Timestamp {
+  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+    match f.precision() {
+      Some(p) => {
+        let float = self.seconds as f64 + self.nanos as f64 / 1_000_000_000.0;
+        write!(f, "{:.*}", p, float)
+      }
+      None => write!(f, "{}", self.seconds),
+    }
+  }
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  #[test]
+  fn test_display() {
+    let t = Timestamp::from(1335020400);
+    assert_eq!(format!("{:.02}", t), "1335020400.00");
+  }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 3b57a5d..215d048 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,7 @@
 #![crate_name = "unix_ts"]
 #![doc = include_str!(concat!(env!("OUT_DIR"), "/README-rustdocified.md"))]
 
+mod display;
 mod integers;
 mod std_duration;
 mod timestamp;
diff --git a/src/timestamp.rs b/src/timestamp.rs
index c65cbe5..5f6ac59 100644
--- a/src/timestamp.rs
+++ b/src/timestamp.rs
@@ -23,37 +23,36 @@ impl Timestamp {
   /// Note: For negative timestamps, the `nanos` argument is _always_ a
   /// positive offset. Therefore, the correct way to represent a timestamp
   /// of `-0.25 seconds` is to call `new(-1, 750_000_000)`.
-  pub fn new(mut seconds: i64, mut nanos: u32) -> Timestamp {
+  pub const fn new(mut seconds: i64, mut nanos: u32) -> Timestamp {
     while nanos >= 1_000_000_000 {
       seconds += 1;
       nanos -= 1_000_000_000;
     }
-    Timestamp { seconds: seconds, nanos: nanos }
+    Timestamp { seconds, nanos }
   }
 
   /// Create a timestamp from the given number of nanoseconds.
-  pub fn from_nanos(nanos: impl Into<i128>) -> Timestamp {
-    let nanos = nanos.into();
-    let seconds: i64 = (nanos / 1_000_000_000)
-      .try_into()
-      .expect("Timestamp value out of range.");
+  pub const fn from_nanos(nanos: i128) -> Timestamp {
+    let seconds: i64 = (nanos / 1_000_000_000) as i64;
+    // .try_into()
+    // .expect("Timestamp value out of range.");
     let nanos = if seconds >= 0 {
       (nanos % 1_000_000_000) as u32
     }
     else {
       (1_000_000_000 - (nanos % 1_000_000_000).abs()) as u32
     };
-    Timestamp { seconds: seconds, nanos: nanos }
+    Timestamp { seconds, nanos }
   }
 
   /// Create a timestamp from the given number of microseconds.
-  pub fn from_micros(micros: impl Into<i128>) -> Timestamp {
-    Timestamp::from_nanos(micros.into() * 1_000)
+  pub const fn from_micros(micros: i64) -> Timestamp {
+    Timestamp::from_nanos(micros as i128 * 1_000)
   }
 
   /// Create a timestamp from the given number of milliseconds.
-  pub fn from_millis(millis: impl Into<i128>) -> Timestamp {
-    Timestamp::from_nanos(millis.into() * 1_000_000)
+  pub const fn from_millis(millis: i64) -> Timestamp {
+    Timestamp::from_nanos(millis as i128 * 1_000_000)
   }
 
   /// Return the seconds since the Unix epoch.
@@ -67,7 +66,7 @@ impl Timestamp {
   /// let t = Timestamp::from(1335020400);
   /// assert_eq!(t.seconds(), 1335020400);
   /// ```
-  pub fn seconds(&self) -> i64 {
+  pub const fn seconds(&self) -> i64 {
     self.seconds
   }
 
@@ -89,9 +88,9 @@ impl Timestamp {
   /// assert_eq!(t.at_precision(3), 1335020400_000);
   /// assert_eq!(t.at_precision(6), 1335020400_000_000);
   /// ```
-  pub fn at_precision(&self, e: u8) -> i128 {
-    i128::from(self.seconds) * 10i128.pow(e.into())
-      + i128::from(self.nanos) / 10i128.pow(9 - u32::from(e))
+  pub const fn at_precision(&self, e: u8) -> i128 {
+    (self.seconds as i128) * 10i128.pow(e as u32)
+      + (self.nanos as i128) / 10i128.pow(9 - (e as u32))
   }
 
   /// Return the subsecond component at the specified precision
@@ -142,6 +141,7 @@ impl Sub for Timestamp {
 }
 
 #[cfg(test)]
+#[allow(clippy::inconsistent_digit_grouping)]
 mod tests {
   use super::*;
   use assert2::check;
@@ -160,11 +160,11 @@ mod tests {
   #[test]
   fn test_from_nanos() {
     check!(
-      Timestamp::from_nanos(1335020400_000_000_000i64)
+      Timestamp::from_nanos(1335020400_000_000_000i128)
         == Timestamp::new(1335020400, 0)
     );
     check!(
-      Timestamp::from_nanos(1335020400_500_000_000i64)
+      Timestamp::from_nanos(1335020400_500_000_000i128)
         == Timestamp::new(1335020400, 500_000_000)
     );
     check!(