diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index 36570d11..69d88cb9 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -1,4 +1,4 @@
-# This file is autogenerated by maturin v0.14.17
+# This file is autogenerated by maturin v1.3.2
 # To update, run
 #
 #    maturin generate-ci --pytest -o .github/workflows/python.yml github
@@ -28,14 +28,27 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: '3.10'
+          python-version: '3.11'
       - name: Build wheels
         uses: PyO3/maturin-action@v1
         with:
           target: ${{ matrix.target }}
           args: --release --out dist --find-interpreter -F python
-          sccache: 'true'
           manylinux: auto
+          before-script-linux: |
+            # If we're running on rhel centos, install needed packages.
+            if command -v yum &> /dev/null; then
+                yum update -y && yum install -y perl-core openssl openssl-devel pkgconfig libatomic
+
+                # If we're running on i686 we need to symlink libatomic
+                # in order to build openssl with -latomic flag.
+                if [[ ! -d "/usr/lib64" ]]; then
+                    ln -s /usr/lib/libatomic.so.1 /usr/lib/libatomic.so
+                fi
+            else
+                # If we're running on debian-based system.
+                apt update -y && apt-get install -y libssl-dev openssl pkg-config
+            fi
       - name: Upload wheels
         uses: actions/upload-artifact@v3
         with:
@@ -74,7 +87,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: '3.10'
+          python-version: '3.11'
           architecture: ${{ matrix.target }}
       - name: Build wheels
         uses: PyO3/maturin-action@v1
@@ -105,7 +118,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: '3.10'
+          python-version: '3.11'
       - name: Build wheels
         uses: PyO3/maturin-action@v1
         with:
@@ -156,4 +169,4 @@ jobs:
           MATURIN_PYPI_TOKEN: ${{ secrets.PYPI_API_TOKEN }}
         with:
           command: upload
-          args: --skip-existing *
+          args: --non-interactive --skip-existing *
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e8d4a7e6..2ee7e22d 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -33,7 +33,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         rust:
-          - { version: "1.64", name: MSRV }
+          - { version: "1.70", name: MSRV }
           - { version: stable, name: stable }
 
     runs-on: ${{ matrix.os }}
diff --git a/Cargo.toml b/Cargo.toml
index 382c5f05..38ad281e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hifitime"
-version = "3.8.2"
+version = "3.8.6"
 authors = ["Christopher Rabotin <christopher.rabotin@gmail.com>"]
 description = "Ultra-precise date and time handling in Rust for scientific applications with leap second support"
 homepage = "https://nyxspace.com/"
@@ -18,16 +18,36 @@ crate-type = ["cdylib", "rlib"]
 name = "hifitime"
 
 [dependencies]
-serde = {version = "1.0.155", optional = true}
-serde_derive = {version = "1.0.155", optional = true}
-der = {version = "0.6.1", features = ["derive", "real"], optional = true}
-pyo3 = { version = "0.19.0", features = ["extension-module"], optional = true }
-num-traits = {version = "0.2.15", default-features = false, features = ["libm"]}
-lexical-core = {version = "0.8.5", default-features = false, features = ["parse-integers", "parse-floats"]}
-reqwest = { version = "0.11", features = ["blocking", "json"], optional = true}
-tabled = {version = "0.12.0", optional = true}
+serde = { version = "1.0.155", optional = true }
+serde_derive = { version = "1.0.155", optional = true }
+der = { version = "0.6.1", features = ["derive", "real"], optional = true }
+pyo3 = { version = "0.20.0", features = ["extension-module"], optional = true }
+num-traits = { version = "0.2.15", default-features = false, features = [
+    "libm",
+] }
+lexical-core = { version = "0.8.5", default-features = false, features = [
+    "parse-integers",
+    "parse-floats",
+] }
+reqwest = { version = "0.11", features = ["blocking", "json"], optional = true }
+tabled = { version = "0.14.0", optional = true }
 openssl = { version = "0.10", features = ["vendored"], optional = true }
 
+[target.wasm32-unknown-unknown.dependencies]
+js-sys = { version = "0.3"}
+wasm-bindgen_rs = { package = "wasm-bindgen", version = "0.2"}
+web-sys = { version = "0.3", features = ['Window', 'Performance', 'PerformanceTiming'] }
+
+[target.wasm32-unknown-emscripten.dependencies]
+js-sys = { version = "0.3"}
+wasm-bindgen_rs = { package = "wasm-bindgen", version = "0.2"}
+web-sys = { version = "0.3", features = ['Window', 'Performance', 'PerformanceTiming'] }
+
+[target.asmjs-unknown-emscripten.dependencies]
+js-sys = { version = "0.3"}
+wasm-bindgen_rs = { package = "wasm-bindgen", version = "0.2"}
+web-sys = { version = "0.3", features = ['Window', 'Performance', 'PerformanceTiming'] }
+
 [dev-dependencies]
 serde_json = "1.0.91"
 criterion = "0.5.1"
@@ -42,7 +62,7 @@ ut1 = ["std", "reqwest", "tabled", "openssl"]
 
 [[bench]]
 name = "crit_epoch"
-harness = false 
+harness = false
 
 [[bench]]
 name = "crit_duration"
diff --git a/README.md b/README.md
index ea93d2cb..3f57bbe3 100644
--- a/README.md
+++ b/README.md
@@ -214,7 +214,7 @@ In Python:
 
 [![hifitime on crates.io][cratesio-image]][cratesio]
 [![hifitime on docs.rs][docsrs-image]][docsrs]
-[![minimum rustc: 1.64](https://img.shields.io/badge/minimum%20rustc-1.64-yellowgreen?logo=rust)](https://www.whatrustisit.com)
+[![minimum rustc: 1.70](https://img.shields.io/badge/minimum%20rustc-1.70-yellowgreen?logo=rust)](https://www.whatrustisit.com)
 [![Build Status](https://github.com/nyx-space/hifitime/actions/workflows/tests.yml/badge.svg?branch=master)](https://github.com/nyx-space/hifitime/actions)
 [![Build Status](https://github.com/nyx-space/hifitime/actions/workflows/formal_verification.yml/badge.svg?branch=master)](https://github.com/nyx-space/hifitime/actions)
 [![codecov](https://codecov.io/gh/nyx-space/hifitime/branch/master/graph/badge.svg?token=l7zU57rUGs)](https://codecov.io/gh/nyx-space/hifitime)
@@ -309,6 +309,12 @@ In order to provide full interoperability with NAIF, hifitime uses the NAIF algo
 
 # Changelog
 
+## 3.8.5
+
+Changes from 3.8.2 are only dependency upgrades until this release.
+
+Minimum Supported Rust version bumped from 1.64 to **1.70**.
+
 ## 3.8.2
 + Clarify README and add a section comparing Hifitime to `time` and `chrono`, cf. [#221](https://github.com/nyx-space/hifitime/issues/221)
 + Fix incorrect printing of Gregorian dates prior to to 1900, cf. [#204](https://github.com/nyx-space/hifitime/issues/204)
diff --git a/examples/python/basic.py b/examples/python/basic.py
index c2e48209..a1523842 100644
--- a/examples/python/basic.py
+++ b/examples/python/basic.py
@@ -1,6 +1,6 @@
 """
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/examples/python/timescales.py b/examples/python/timescales.py
index 162e40a9..a3011178 100644
--- a/examples/python/timescales.py
+++ b/examples/python/timescales.py
@@ -1,6 +1,6 @@
 """
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/pyproject.toml b/pyproject.toml
index fd60678d..16607264 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["maturin>=0.13,<0.14"]
+requires = ["maturin>=1.3,<1.4"]
 build-backend = "maturin"
 
 [project]
@@ -15,4 +15,4 @@ classifiers = [
 [tool.yapf]
 based_on_style = "google"
 spaces_before_comment = 4
-column_limit = 100
\ No newline at end of file
+column_limit = 100
diff --git a/src/asn1der.rs b/src/asn1der.rs
index 0e3e7731..73a41088 100644
--- a/src/asn1der.rs
+++ b/src/asn1der.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/deprecated.rs b/src/deprecated.rs
index 4b6e3685..40da9311 100644
--- a/src/deprecated.rs
+++ b/src/deprecated.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/duration.rs b/src/duration.rs
index d733ac5f..43260d88 100644
--- a/src/duration.rs
+++ b/src/duration.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
@@ -730,15 +730,23 @@ impl Duration {
     }
 
     #[cfg(feature = "python")]
-    fn __richcmp__(&self, other: Self, op: CompareOp) -> bool {
-        match op {
-            CompareOp::Lt => *self < other,
-            CompareOp::Le => *self <= other,
-            CompareOp::Eq => *self == other,
-            CompareOp::Ne => *self != other,
-            CompareOp::Gt => *self > other,
-            CompareOp::Ge => *self >= other,
-        }
+    fn __le__(&self, other: Self) -> bool {
+        *self <= other
+    }
+
+    #[cfg(feature = "python")]
+    fn __lt__(&self, other: Self) -> bool {
+        *self < other
+    }
+
+    #[cfg(feature = "python")]
+    fn __ge__(&self, other: Self) -> bool {
+        *self >= other
+    }
+
+    #[cfg(feature = "python")]
+    fn __gt__(&self, other: Self) -> bool {
+        *self > other
     }
 
     // Python constructors
diff --git a/src/efmt/consts.rs b/src/efmt/consts.rs
index 020795f2..3c2f21e4 100644
--- a/src/efmt/consts.rs
+++ b/src/efmt/consts.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/efmt/format.rs b/src/efmt/format.rs
index 4333eb44..e1819dab 100644
--- a/src/efmt/format.rs
+++ b/src/efmt/format.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
@@ -309,7 +309,14 @@ impl Format {
         };
 
         let epoch = match day_of_year {
-            Some(days) => Epoch::from_day_of_year(decomposed[0], days, ts),
+            Some(days) => {
+                // Parse the elapsed time in the given day
+                let elapsed = (decomposed[3] as i64) * Unit::Hour
+                    + (decomposed[4] as i64) * Unit::Minute
+                    + (decomposed[5] as i64) * Unit::Second
+                    + (decomposed[6] as i64) * Unit::Nanosecond;
+                Epoch::from_day_of_year(decomposed[0], days, ts) + elapsed
+            }
             None => Epoch::maybe_from_gregorian(
                 decomposed[0],
                 decomposed[1].try_into().unwrap(),
@@ -522,3 +529,11 @@ fn epoch_format_from_str() {
     let fmt = Format::from_str("%a, %d %b %Y %H:%M:%S").unwrap();
     assert_eq!(fmt, crate::efmt::consts::RFC2822);
 }
+
+#[cfg(feature = "std")]
+#[test]
+fn gh_248_regression() {
+    let e = Epoch::from_format_str("2023-117T12:55:26", "%Y-%jT%H:%M:%S").unwrap();
+
+    assert_eq!(format!("{e}"), "2023-04-28T12:55:26 UTC");
+}
diff --git a/src/efmt/formatter.rs b/src/efmt/formatter.rs
index 3922910a..922a85ad 100644
--- a/src/efmt/formatter.rs
+++ b/src/efmt/formatter.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/efmt/mod.rs b/src/efmt/mod.rs
index 8f193283..cc0e9f8f 100644
--- a/src/efmt/mod.rs
+++ b/src/efmt/mod.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/epoch.rs b/src/epoch.rs
index b86020f4..3ba44ee8 100644
--- a/src/epoch.rs
+++ b/src/epoch.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
@@ -44,8 +44,6 @@ use crate::leap_seconds_file::LeapSecondsFile;
 use serde_derive::{Deserialize, Serialize};
 
 use core::str::FromStr;
-#[cfg(feature = "std")]
-use std::time::SystemTime;
 
 #[cfg(not(feature = "std"))]
 use num_traits::{Euclid, Float};
@@ -676,6 +674,12 @@ impl Epoch {
         )
     }
 
+    #[must_use]
+    /// Initialize an Epoch from the provided duration since UTC midnight 1970 January 01.
+    pub fn from_unix_duration(duration: Duration) -> Self {
+        Self::from_utc_duration(UNIX_REF_EPOCH.to_utc_duration() + duration)
+    }
+
     #[must_use]
     /// Initialize an Epoch from the provided UNIX second timestamp since UTC midnight 1970 January 01.
     pub fn from_unix_seconds(seconds: f64) -> Self {
@@ -2933,12 +2937,11 @@ impl Epoch {
 impl Epoch {
     /// Initializes a new Epoch from `now`.
     /// WARNING: This assumes that the system time returns the time in UTC (which is the case on Linux)
-    /// Uses [`std::time::SystemTime::now`](https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.now) under the hood
+    /// Uses [`std::time::SystemTime::now`](https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.now)
+    /// or javascript interop under the hood
     pub fn now() -> Result<Self, Errors> {
-        match SystemTime::now().duration_since(SystemTime::UNIX_EPOCH) {
-            Ok(std_duration) => Ok(Self::from_unix_seconds(std_duration.as_secs_f64())),
-            Err(_) => Err(Errors::SystemTimeError),
-        }
+        let duration = crate::system_time::duration_since_unix_epoch()?;
+        Ok(Self::from_unix_duration(duration))
     }
 }
 
diff --git a/src/errors.rs b/src/errors.rs
index a7eb91c2..473b05dc 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/leap_seconds.rs b/src/leap_seconds.rs
index 54687c6b..a02f166d 100644
--- a/src/leap_seconds.rs
+++ b/src/leap_seconds.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/leap_seconds_file.rs b/src/leap_seconds_file.rs
index a0a1dd46..efbad593 100644
--- a/src/leap_seconds_file.rs
+++ b/src/leap_seconds_file.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/lib.rs b/src/lib.rs
index 46e80fe8..74020118 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3,7 +3,7 @@
 
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
@@ -141,3 +141,6 @@ pub mod python;
 
 #[cfg(feature = "std")]
 extern crate core;
+
+#[cfg(feature = "std")]
+mod system_time;
diff --git a/src/month.rs b/src/month.rs
index b0f7d984..8837daec 100644
--- a/src/month.rs
+++ b/src/month.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/parser.rs b/src/parser.rs
index 78e498d9..7a4b4828 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/python.rs b/src/python.rs
index ca95994d..abbee374 100644
--- a/src/python.rs
+++ b/src/python.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/system_time.rs b/src/system_time.rs
new file mode 100644
index 00000000..03d656b2
--- /dev/null
+++ b/src/system_time.rs
@@ -0,0 +1,22 @@
+use crate::{Duration, Errors};
+
+#[cfg(target_arch = "wasm32")]
+pub(crate) fn duration_since_unix_epoch() -> Result<Duration, Errors> {
+    {
+        use crate::Unit;
+        use wasm_bindgen_rs::prelude::*;
+        js_sys::Reflect::get(&js_sys::global(), &JsValue::from_str("performance"))
+            .map_err(|_| Errors::SystemTimeError)
+            .map(|performance| {
+                performance.unchecked_into::<web_sys::Performance>().now() * Unit::Second
+            })
+    }
+}
+
+#[cfg(not(target_arch = "wasm32"))]
+pub(crate) fn duration_since_unix_epoch() -> Result<Duration, Errors> {
+    std::time::SystemTime::now()
+        .duration_since(std::time::SystemTime::UNIX_EPOCH)
+        .map_err(|_| Errors::SystemTimeError)
+        .and_then(|d| d.try_into().map_err(|_| Errors::SystemTimeError))
+}
diff --git a/src/timescale.rs b/src/timescale.rs
index 22ab3a82..39bbe52d 100644
--- a/src/timescale.rs
+++ b/src/timescale.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/timeseries.rs b/src/timeseries.rs
index bc53f8ae..d04fded5 100644
--- a/src/timeseries.rs
+++ b/src/timeseries.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/timeunits.rs b/src/timeunits.rs
index fc535b60..ac6ef850 100644
--- a/src/timeunits.rs
+++ b/src/timeunits.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/ut1.rs b/src/ut1.rs
index e88afb46..bf3a3606 100644
--- a/src/ut1.rs
+++ b/src/ut1.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/src/weekday.rs b/src/weekday.rs
index fe3be0fd..484f3acf 100644
--- a/src/weekday.rs
+++ b/src/weekday.rs
@@ -1,6 +1,6 @@
 /*
  * Hifitime, part of the Nyx Space tools
- * Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
+ * Copyright (C) 2023 Christopher Rabotin <christopher.rabotin@gmail.com> et al. (cf. AUTHORS.md)
  * This Source Code Form is subject to the terms of the Apache
  * v. 2.0. If a copy of the Apache License was not distributed with this
  * file, You can obtain one at https://www.apache.org/licenses/LICENSE-2.0.
diff --git a/tests/python/test_epoch.py b/tests/python/test_epoch.py
index 0e2c7265..1e39c8f6 100644
--- a/tests/python/test_epoch.py
+++ b/tests/python/test_epoch.py
@@ -1,4 +1,4 @@
-from hifitime import Epoch, TimeSeries, Unit
+from hifitime import Epoch, TimeSeries, Unit, Duration
 from datetime import datetime
 
 
@@ -22,7 +22,7 @@ def test_utcnow():
     dt = datetime.utcnow()
 
     # Hifitime uses a different clock to Python and print down to the nanosecond
-    assert dt.isoformat()[:21] == f"{epoch}"[:21]
+    assert dt.isoformat()[:20] == f"{epoch}"[:20]
 
 
 def test_time_series():
@@ -44,3 +44,14 @@ def test_time_series():
         print(f"#{num}:\t{epoch}")
 
     assert num == 10
+
+def test_duration_eq():
+    """
+    Checks that Duration comparisons work
+    """
+
+    assert Unit.Second * 0.0 == Duration("0 ns")
+    assert Unit.Second * 1.0 >= Duration("0 ns")
+    assert Unit.Second * 1.0 > Duration("0 ns")
+    assert Duration("0 ns") <= Unit.Second * 1.0
+    assert Duration("0 ns") < Unit.Second * 1.0
\ No newline at end of file
diff --git a/tests/ut1.rs b/tests/ut1.rs
index 2934e883..2f6a29c4 100644
--- a/tests/ut1.rs
+++ b/tests/ut1.rs
@@ -46,6 +46,6 @@ fn test_ut1_from_jpl() {
     let ut1_epoch = epoch.to_ut1(provider);
     assert_eq!(
         format!("{:x}", ut1_epoch),
-        "2022-01-03T03:05:06.679020600 TAI",
+        "2022-01-03T03:05:43.789100000 TAI",
     );
 }