diff --git a/src/builtins/test.rs b/src/builtins/test.rs
index 9fafb53..d3a473d 100644
--- a/src/builtins/test.rs
+++ b/src/builtins/test.rs
@@ -3,15 +3,15 @@
 
 use crate::ast::{Expr, Ref};
 use crate::builtins;
+use crate::builtins::time;
 use crate::builtins::utils::{ensure_args_count, ensure_string};
 use crate::lexer::Span;
 use crate::value::Value;
 
 use std::collections::HashMap;
 use std::thread;
-use std::time::Duration;
 
-use anyhow::{bail, Ok, Result};
+use anyhow::{Ok, Result};
 
 pub fn register(m: &mut HashMap<&'static str, builtins::BuiltinFcn>) {
     m.insert("test.sleep", (sleep, 1));
@@ -22,19 +22,9 @@ fn sleep(span: &Span, params: &[Ref<Expr>], args: &[Value], _strict: bool) -> Re
     ensure_args_count(span, name, params, args, 1)?;
 
     let val = ensure_string(name, &params[0], &args[0])?;
+    let dur = time::compat::parse_duration(val.as_ref())?;
 
-    let duration = if let Some(millis) = val.strip_suffix("ms").and_then(|v| v.parse().ok()) {
-        Duration::from_millis(millis)
-    } else if let Some(secs) = val.strip_suffix("s").and_then(|v| v.parse().ok()) {
-        Duration::from_secs(secs)
-    } else {
-        bail!(params[0].span().error(
-            format!("`{name}` expects a simple duration ends with `ms` or `s`. Got {val} instead")
-                .as_str()
-        ))
-    };
-
-    thread::sleep(duration);
+    thread::sleep(dur.to_std()?);
 
     Ok(Value::Null)
 }
diff --git a/src/builtins/time.rs b/src/builtins/time.rs
index b45471e..f7dee39 100644
--- a/src/builtins/time.rs
+++ b/src/builtins/time.rs
@@ -17,6 +17,7 @@ use chrono::{
 };
 use chrono_tz::Tz;
 
+pub(in crate::builtins) mod compat;
 mod diff;
 
 pub fn register(m: &mut HashMap<&'static str, builtins::BuiltinFcn>) {
@@ -26,6 +27,7 @@ pub fn register(m: &mut HashMap<&'static str, builtins::BuiltinFcn>) {
     m.insert("time.diff", (diff, 2));
     m.insert("time.format", (format, 1));
     m.insert("time.now_ns", (now_ns, 0));
+    m.insert("time.parse_duration_ns", (parse_duration_ns, 1));
     m.insert("time.parse_ns", (parse_ns, 2));
     m.insert("time.parse_rfc3339_ns", (parse_rfc3339_ns, 1));
     m.insert("time.weekday", (weekday, 1));
@@ -136,6 +138,20 @@ fn now_ns(span: &Span, params: &[Ref<Expr>], args: &[Value], strict: bool) -> Re
     safe_timestamp_nanos(span, strict, Utc::now().timestamp_nanos_opt())
 }
 
+fn parse_duration_ns(
+    span: &Span,
+    params: &[Ref<Expr>],
+    args: &[Value],
+    strict: bool,
+) -> Result<Value> {
+    let name = "time.parse_duration_ns";
+    ensure_args_count(span, name, params, args, 1)?;
+
+    let value = ensure_string(name, &params[0], &args[0])?;
+    let dur = compat::parse_duration(value.as_ref())?;
+    safe_timestamp_nanos(span, strict, dur.num_nanoseconds())
+}
+
 fn parse_ns(span: &Span, params: &[Ref<Expr>], args: &[Value], strict: bool) -> Result<Value> {
     let name = "time.parse_ns";
     ensure_args_count(span, name, params, args, 2)?;
diff --git a/src/builtins/time/compat.rs b/src/builtins/time/compat.rs
new file mode 100644
index 0000000..aa25b14
--- /dev/null
+++ b/src/builtins/time/compat.rs
@@ -0,0 +1,356 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+//
+// This module contains methods for compatibility with Go's `time` package.
+//
+// Copyright (c) 2009 The Go Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+use std::error::Error;
+use std::fmt;
+
+use chrono::Duration;
+
+const NANOSECOND: u64 = 1;
+const MICROSECOND: u64 = 1000 * NANOSECOND;
+const MILLISECOND: u64 = 1000 * MICROSECOND;
+const SECOND: u64 = 1000 * MILLISECOND;
+const MINUTE: u64 = 60 * SECOND;
+const HOUR: u64 = 60 * MINUTE;
+
+#[derive(Debug)]
+pub enum ParseDurationError {
+    InvalidDuration(String),
+    UnknownUnit(String),
+    Overflow,
+}
+
+impl fmt::Display for ParseDurationError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            ParseDurationError::InvalidDuration(dur) => {
+                write!(f, "invalid duration: {dur}")
+            }
+            ParseDurationError::UnknownUnit(unit) => {
+                write!(f, "unknown unit: {unit}")
+            }
+            ParseDurationError::Overflow => {
+                write!(f, "overflow")
+            }
+        }
+    }
+}
+
+impl Error for ParseDurationError {}
+
+// Parses a duration string in the form of `10h12m45s`.
+//
+// Adapted from Go's `time.ParseDuration`:
+// https://github.com/golang/go/blob/8db131082d08e497fd8e9383d0ff7715e1bef478/src/time/format.go#L1584-L1686
+pub fn parse_duration(mut s: &str) -> Result<Duration, ParseDurationError> {
+    // Input is in the format of `[-+]?([0-9]*(\.[0-9]*)?[a-z]+)+`
+    let orig = s;
+
+    // Consume [-+]?
+    let neg = if s.starts_with('-') {
+        s = &s[1..];
+        true
+    } else if s.starts_with('+') {
+        s = &s[1..];
+        false
+    } else {
+        false
+    };
+
+    // Special case: if all that is left is "0", this is zero.
+    if s == "0" {
+        return Ok(Duration::zero());
+    }
+
+    if s.is_empty() {
+        return Err(ParseDurationError::InvalidDuration(orig.to_string()));
+    }
+
+    let mut dur = 0u64;
+
+    while !s.is_empty() {
+        // The next character must be [0-9.]
+        if !(s.starts_with('.') || s.starts_with(|c: char| c.is_ascii_digit())) {
+            return Err(ParseDurationError::InvalidDuration(orig.to_string()));
+        }
+
+        let previous_len = s.len();
+        // v is the integers before the decimal point
+        // Consume [0-9]*
+        let (mut v, rem) = leading_int(s)?;
+        s = rem;
+
+        // whether we consumed anything before a period
+        let pre = previous_len != s.len();
+
+        // Consume (\.[0-9]*)?
+        let mut post = false;
+        let mut f = 0;
+        let mut scale = 0.0;
+        if !s.is_empty() && s.starts_with('.') {
+            s = &s[1..];
+            let previous_len = s.len();
+            (f, scale, s) = leading_fraction(s);
+            post = previous_len != s.len();
+        }
+        if !pre && !post {
+            // no digits (e.g. ".s" or "-.s")
+            return Err(ParseDurationError::InvalidDuration(orig.to_string()));
+        }
+
+        // Consume unit.
+        let mut idx = 0;
+        for (i, c) in s.char_indices() {
+            if c == '.' || c.is_ascii_digit() {
+                break;
+            }
+            idx = i;
+        }
+
+        let unit = match &s[..idx + 1] {
+            "ns" => NANOSECOND,
+            "us" => MICROSECOND,
+            "µs" => MICROSECOND, // U+00B5 = micro symbol
+            "μs" => MICROSECOND, // U+03BC = Greek letter mu
+            "ms" => MILLISECOND,
+            "s" => SECOND,
+            "m" => MINUTE,
+            "h" => HOUR,
+            unkonwn => return Err(ParseDurationError::UnknownUnit(unkonwn.to_string())),
+        };
+
+        s = &s[idx + 1..];
+
+        if v > ((1 << 63) / unit) {
+            // overflow
+            return Err(ParseDurationError::InvalidDuration(orig.to_string()));
+        }
+        v *= unit;
+        if f > 0 {
+            // f64 is needed to be nanosecond accurate for fractions of hours.
+            // v >= 0 && (f*unit/scale) <= 3.6e+12 (ns/h, h is the largest unit)
+            v += (f as f64 * (unit as f64 / scale)) as u64;
+            if v > 1 << 63 {
+                // overflow
+                return Err(ParseDurationError::InvalidDuration(orig.to_string()));
+            }
+        }
+
+        dur += v;
+        if dur > 1 << 63 {
+            return Err(ParseDurationError::InvalidDuration(orig.to_string()));
+        }
+    }
+
+    if neg {
+        let dur = dur as i64;
+        if dur < 0 {
+            return Ok(Duration::nanoseconds(dur));
+        }
+        return Ok(-Duration::nanoseconds(dur));
+    }
+
+    if dur > i64::MAX as u64 {
+        return Err(ParseDurationError::InvalidDuration(orig.to_string()));
+    }
+
+    Ok(Duration::nanoseconds(dur as i64))
+}
+
+fn leading_int(s: &str) -> Result<(u64, &str), ParseDurationError> {
+    let mut last_idx = 0;
+    let mut num: u64 = 0;
+    for (i, c) in s.char_indices() {
+        last_idx = i;
+
+        let n = match c.to_digit(10) {
+            Some(n) => n as u64,
+            None => break,
+        };
+
+        if num > ((1 << 63) / 10) {
+            // overflow
+            return Err(ParseDurationError::Overflow);
+        }
+
+        num = num * 10 + n;
+
+        if num > 1 << 63 {
+            // overflow
+            return Err(ParseDurationError::Overflow);
+        }
+    }
+
+    Ok((num, &s[last_idx..]))
+}
+
+fn leading_fraction(s: &str) -> (u64, f64, &str) {
+    let mut num: u64 = 0;
+    let mut scale = 1.0;
+    let mut overflow = false;
+    let mut last_idx = 0;
+    for (i, c) in s.char_indices() {
+        last_idx = i;
+
+        let n = match c.to_digit(10) {
+            Some(n) => n as u64,
+            None => break,
+        };
+
+        if overflow {
+            continue;
+        }
+
+        if num > (i64::MAX as u64 / 10) {
+            // It's possible for overflow to give a positive number, so take care.
+            overflow = true;
+            continue;
+        }
+
+        let y = num * 10 + n;
+        if y > 1 << 63 {
+            overflow = true;
+            continue;
+        }
+
+        num = y;
+        scale *= 10.0;
+    }
+
+    (num, scale, &s[last_idx..])
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn parses_durations() {
+        // Test cases are copied from Go's `time.ParseDuration` tests:
+        // https://github.com/golang/go/blob/8db131082d08e497fd8e9383d0ff7715e1bef478/src/time/time_test.go#L891-L951
+
+        for (input, expected_dur) in [
+            // simple
+            ("0", Duration::zero()),
+            ("5s", Duration::seconds(5)),
+            ("30s", Duration::seconds(30)),
+            ("1478s", Duration::seconds(1478)),
+            // sign
+            ("-5s", -Duration::seconds(5)),
+            ("+5s", Duration::seconds(5)),
+            ("-0", Duration::zero()),
+            ("+0", Duration::zero()),
+            // decimal
+            ("5.0s", Duration::seconds(5)),
+            ("5.6s", Duration::seconds(5) + Duration::milliseconds(600)),
+            ("5.s", Duration::seconds(5)),
+            (".5s", Duration::milliseconds(500)),
+            ("1.0s", Duration::seconds(1)),
+            ("1.00s", Duration::seconds(1)),
+            ("1.004s", Duration::seconds(1) + Duration::milliseconds(4)),
+            ("1.0040s", Duration::seconds(1) + Duration::milliseconds(4)),
+            (
+                "100.00100s",
+                Duration::seconds(100) + Duration::milliseconds(1),
+            ),
+            // different units
+            ("10ns", Duration::nanoseconds(10)),
+            ("11us", Duration::microseconds(11)),
+            ("12µs", Duration::microseconds(12)), // U+00B5
+            ("12μs", Duration::microseconds(12)), // U+03BC
+            ("13ms", Duration::milliseconds(13)),
+            ("14s", Duration::seconds(14)),
+            ("15m", Duration::minutes(15)),
+            ("16h", Duration::hours(16)),
+            // composite durations
+            ("3h30m", Duration::hours(3) + Duration::minutes(30)),
+            (
+                "10.5s4m",
+                Duration::minutes(4) + Duration::seconds(10) + Duration::milliseconds(500),
+            ),
+            (
+                "-2m3.4s",
+                -(Duration::minutes(2) + Duration::seconds(3) + Duration::milliseconds(400)),
+            ),
+            (
+                "1h2m3s4ms5us6ns",
+                Duration::hours(1)
+                    + Duration::minutes(2)
+                    + Duration::seconds(3)
+                    + Duration::milliseconds(4)
+                    + Duration::microseconds(5)
+                    + Duration::nanoseconds(6),
+            ),
+            (
+                "39h9m14.425s",
+                Duration::hours(39)
+                    + Duration::minutes(9)
+                    + Duration::seconds(14)
+                    + Duration::milliseconds(425),
+            ),
+            // large value
+            ("52763797000ns", Duration::nanoseconds(52763797000)),
+            // more than 9 digits after decimal point, see https://golang.org/issue/6617
+            ("0.3333333333333333333h", Duration::minutes(20)),
+            // 9007199254740993 = 1<<53+1 cannot be stored precisely in a float64
+            ("9007199254740993ns", Duration::nanoseconds((1 << 53) + 1)),
+            // largest duration that can be represented by int64 in nanoseconds
+            ("9223372036854775807ns", Duration::nanoseconds(i64::MAX)),
+            ("9223372036854775.807us", Duration::nanoseconds(i64::MAX)),
+            (
+                "9223372036s854ms775us807ns",
+                Duration::nanoseconds(i64::MAX),
+            ),
+            ("-9223372036854775808ns", Duration::nanoseconds(i64::MIN)),
+            ("-9223372036854775.808us", Duration::nanoseconds(i64::MIN)),
+            (
+                "-9223372036s854ms775us808ns",
+                Duration::nanoseconds(i64::MIN),
+            ),
+            // largest negative value
+            ("-9223372036854775808ns", Duration::nanoseconds(i64::MIN)),
+            // largest negative round trip value, see https://golang.org/issue/48629
+            ("-2562047h47m16.854775808s", Duration::nanoseconds(i64::MIN)),
+            // huge string; issue 15011.
+            ("0.100000000000000000000h", Duration::minutes(6)),
+            // This value tests the first overflow check in leadingFraction.
+            (
+                "0.830103483285477580700h",
+                Duration::minutes(49) + Duration::seconds(48) + Duration::nanoseconds(372539827),
+            ),
+        ] {
+            let dur = parse_duration(input).unwrap();
+            assert_eq!(dur, expected_dur);
+        }
+    }
+}
diff --git a/tests/interpreter/cases/builtins/time/parse_duration_ns.yaml b/tests/interpreter/cases/builtins/time/parse_duration_ns.yaml
new file mode 100644
index 0000000..c89f715
--- /dev/null
+++ b/tests/interpreter/cases/builtins/time/parse_duration_ns.yaml
@@ -0,0 +1,47 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+cases:
+  - note: simple
+    data: {}
+    modules:
+      - |
+        package test
+
+        a := time.parse_duration_ns("1h")
+        b := time.parse_duration_ns("5m")
+        c := time.parse_duration_ns("45s")
+        d := time.parse_duration_ns("15ms")
+    query: data.test
+    want_result:
+      a: 3600000000000
+      b: 300000000000
+      c: 45000000000
+      d: 15000000
+
+  - note: complex
+    data: {}
+    modules:
+      - |
+        package test
+
+        a := time.parse_duration_ns("1h6m13.3s20ms15µs1ns")
+        b := time.parse_duration_ns("1.2h20.2ms15µs56ns")
+        c := time.parse_duration_ns("45.67s123ms")
+        d := time.parse_duration_ns("15.000001ms")
+    query: data.test
+    want_result:
+      a: 3973320015001
+      b: 4320020215056
+      c: 45793000000
+      d: 15000001
+
+  - note: invalid-type
+    data: {}
+    modules:
+      - |
+        package test
+
+        a := time.parse_duration_ns(100)
+    query: data.test
+    error: '`time.parse_duration_ns` expects string argument. Got `100` instead'