diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1547e62..0637896 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
       matrix:
         rust:
           - stable
-          - 1.67
+          - 1.70
         include:
           - rust: stable
             extra_components: rustfmt
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e87d037..73d4f9c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## unreleased
+
+*   update minimum Rust to 1.70.
+*   use [`jiff`](https://crates.io/crates/jiff) for date formatting.
+
 ## `v0.4.9` (2024-08-19)
 
 *   added helpers for building `.mp4` `VisualSampleEntry` and `AudioSampleEntry`
diff --git a/Cargo.lock b/Cargo.lock
index 6c574a3..8541012 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1083,6 +1083,31 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "112c678d4050afce233f4f2852bb2eb519230b3cf12f33585275537d7e41578d"
 
+[[package]]
+name = "jiff"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db2b7379a75544c94b3da32821b0bf41f9062e9970e23b78cc577d0d89676d16"
+dependencies = [
+ "jiff-tzdb-platform",
+ "windows-sys 0.52.0",
+]
+
+[[package]]
+name = "jiff-tzdb"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05fac328b3df1c0f18a3c2ab6cb7e06e4e549f366017d796e3e66b6d6889abe6"
+
+[[package]]
+name = "jiff-tzdb-platform"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8da387d5feaf355954c2c122c194d6df9c57d865125a67984bb453db5336940"
+dependencies = [
+ "jiff-tzdb",
+]
+
 [[package]]
 name = "js-sys"
 version = "0.3.58"
@@ -1720,6 +1745,7 @@ dependencies = [
  "h264-reader",
  "hex",
  "http-auth",
+ "jiff",
  "log",
  "mylog",
  "once_cell",
@@ -1730,7 +1756,6 @@ dependencies = [
  "sdp-types",
  "smallvec",
  "thiserror",
- "time 0.1.44",
  "tokio",
  "tokio-util",
  "url",
diff --git a/Cargo.toml b/Cargo.toml
index 6d0730a..ef7e539 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["network-programming", "multimedia"]
 description = "high-level RTSP multimedia streaming library"
 repository = "https://github.com/scottlamb/retina"
 include = ["src/**/*", "benches", "Cargo.toml"]
-rust-version = "1.67"
+rust-version = "1.70"
 
 [package.metadata.docs.rs]
 # https://docs.rs/about/metadata
@@ -29,6 +29,7 @@ futures = "0.3.14"
 h264-reader = "0.7.0"
 hex = "0.4.3"
 http-auth = "0.1.2"
+jiff = "0.1.8"
 log = "0.4.8"
 once_cell = "1.7.2"
 pin-project = "1.0.7"
@@ -38,7 +39,6 @@ rtsp-types = "0.1.0"
 sdp-types = "0.1.4"
 smallvec = { version = "1.6.1", features = ["union"] }
 thiserror = "1.0.25"
-time = "0.1.43"
 tokio = { version = "1.11.0", features = ["macros", "net", "rt", "time"] }
 tokio-util = { version = "0.7.3", features = ["codec"] }
 url = "2.2.1"
diff --git a/src/lib.rs b/src/lib.rs
index 38de38b..ee8329f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -204,21 +204,11 @@ impl std::fmt::Display for NtpTimestamp {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let since_epoch = self.0.wrapping_sub(UNIX_EPOCH.0);
         let sec_since_epoch = (since_epoch >> 32) as u32;
-        let tm = time::at(time::Timespec {
-            sec: i64::from(sec_since_epoch),
-            nsec: 0,
-        });
-        let ms = ((since_epoch & 0xFFFF_FFFF) * 1_000) >> 32;
-        let zone_minutes = tm.tm_utcoff.abs() / 60;
-        write!(
-            f,
-            "{}.{:03}{}{:02}:{:02}",
-            tm.strftime("%FT%T").map_err(|_| std::fmt::Error)?,
-            ms,
-            if tm.tm_utcoff > 0 { '+' } else { '-' },
-            zone_minutes / 60,
-            zone_minutes % 60
-        )
+        let ns = i32::try_from(((since_epoch & 0xFFFF_FFFF) * 1_000_000_000) >> 32)
+            .expect("should be < 1_000_000_000");
+        let tm = jiff::Timestamp::new(i64::from(sec_since_epoch), ns)
+            .expect("u32 sec should be valid Timestamp");
+        std::fmt::Display::fmt(&tm, f)
     }
 }
 
@@ -233,22 +223,17 @@ impl std::fmt::Debug for NtpTimestamp {
 ///
 /// Currently this just allows formatting via `Debug` and `Display`.
 #[derive(Copy, Clone, Debug)]
-pub struct WallTime(time::Timespec);
+pub struct WallTime(jiff::Timestamp);
 
 impl WallTime {
     fn now() -> Self {
-        Self(time::get_time())
+        Self(jiff::Timestamp::now())
     }
 }
 
 impl Display for WallTime {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        std::fmt::Display::fmt(
-            &time::at(self.0)
-                .strftime("%FT%T")
-                .map_err(|_| std::fmt::Error)?,
-            f,
-        )
+        std::fmt::Display::fmt(&self.0, f)
     }
 }