diff --git a/Cargo.lock b/Cargo.lock
index 3cd7a493961..8a1579edc45 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2135,13 +2135,12 @@ dependencies = [
 
 [[package]]
 name = "parse_datetime"
-version = "0.11.0"
+version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c5b77d27257a460cefd73a54448e5f3fd4db224150baf6ca3e02eedf4eb2b3e9"
+checksum = "77d45119ed61100f40b2389d8ed12e51ec869046d4279afbb5a7c73a4733be36"
 dependencies = [
- "chrono",
+ "jiff",
  "num-traits",
- "regex",
  "winnow",
 ]
 
@@ -4128,6 +4127,7 @@ dependencies = [
  "clap",
  "filetime",
  "fluent",
+ "jiff",
  "parse_datetime",
  "thiserror 2.0.17",
  "uucore",
diff --git a/Cargo.toml b/Cargo.toml
index 56b7c742fde..311ad95c6cb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -352,7 +352,7 @@ num-prime = "0.4.4"
 num-traits = "0.2.19"
 number_prefix = "0.4"
 onig = { version = "~6.5.1", default-features = false }
-parse_datetime = "0.11.0"
+parse_datetime = "0.13.0"
 phf = "0.13.1"
 phf_codegen = "0.13.1"
 platform-info = "2.0.3"
diff --git a/fuzz/Cargo.lock b/fuzz/Cargo.lock
index b7c7e85cf2e..1f8eeab9fbf 100644
--- a/fuzz/Cargo.lock
+++ b/fuzz/Cargo.lock
@@ -1071,13 +1071,12 @@ checksum = "1a80800c0488c3a21695ea981a54918fbb37abf04f4d0720c453632255e2ff0e"
 
 [[package]]
 name = "parse_datetime"
-version = "0.11.0"
+version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c5b77d27257a460cefd73a54448e5f3fd4db224150baf6ca3e02eedf4eb2b3e9"
+checksum = "77d45119ed61100f40b2389d8ed12e51ec869046d4279afbb5a7c73a4733be36"
 dependencies = [
- "chrono",
+ "jiff",
  "num-traits",
- "regex",
  "winnow",
 ]
 
diff --git a/src/uu/date/src/date.rs b/src/uu/date/src/date.rs
index e8a0af266bc..c3381dfbd2a 100644
--- a/src/uu/date/src/date.rs
+++ b/src/uu/date/src/date.rs
@@ -3,7 +3,7 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
-// spell-checker:ignore strtime ; (format) DATEFILE MMDDhhmm ; (vars) datetime datetimes getres
+// spell-checker:ignore strtime ; (format) DATEFILE MMDDhhmm ; (vars) datetime datetimes getres AWST ACST AEST
 
 use clap::{Arg, ArgAction, Command};
 use jiff::fmt::strtime;
@@ -459,8 +459,9 @@ fn make_format_string(settings: &Settings) -> &str {
 /// - MST: Mountain Standard Time (US) preferred over Malaysia Standard Time
 /// - PST: Pacific Standard Time (US) - widely used abbreviation
 /// - GMT: Alias for UTC (universal)
+/// - Australian timezones: AWST, ACST, AEST (cannot be dynamically discovered)
 ///
-/// All other timezones (AWST, JST, CET, etc.) are dynamically resolved from IANA database. // spell-checker:disable-line
+/// All other timezones (JST, CET, etc.) are dynamically resolved from IANA database. // spell-checker:disable-line
 static PREFERRED_TZ_MAPPINGS: &[(&str, &str)] = &[
     // Universal (no ambiguity, but commonly used)
     ("UTC", "UTC"),
@@ -475,7 +476,15 @@ static PREFERRED_TZ_MAPPINGS: &[(&str, &str)] = &[
     ("EST", "America/New_York"), // Ambiguous: US vs Australia
     ("EDT", "America/New_York"),
     // Other highly ambiguous cases
-    ("IST", "Asia/Kolkata"), // Ambiguous: India vs Israel vs Ireland // spell-checker:disable-line
+    /* spell-checker: disable */
+    ("IST", "Asia/Kolkata"), // Ambiguous: India vs Israel vs Ireland
+    // Australian timezones (cannot be discovered from IANA location names)
+    ("AWST", "Australia/Perth"),    // Australian Western Standard Time
+    ("ACST", "Australia/Adelaide"), // Australian Central Standard Time
+    ("ACDT", "Australia/Adelaide"), // Australian Central Daylight Time
+    ("AEST", "Australia/Sydney"),   // Australian Eastern Standard Time
+    ("AEDT", "Australia/Sydney"),   // Australian Eastern Daylight Time
+                                    /* spell-checker: enable */
 ];
 
 /// Lazy-loaded timezone abbreviation lookup map built from IANA database.
@@ -547,18 +556,15 @@ fn resolve_tz_abbreviation<S: AsRef<str>>(date_str: S) -> String {
                     // Try to parse the date with UTC first to get timestamp
                     let date_with_utc = format!("{date_part} +00:00");
                     if let Ok(parsed) = parse_datetime::parse_datetime(&date_with_utc) {
-                        // Create timestamp from parsed date
-                        if let Ok(ts) = Timestamp::new(
-                            parsed.timestamp(),
-                            parsed.timestamp_subsec_nanos() as i32,
-                        ) {
-                            // Get the offset for this specific timestamp in the target timezone
-                            let zoned = ts.to_zoned(tz);
-                            let offset_str = format!("{}", zoned.offset());
-
-                            // Replace abbreviation with offset
-                            return format!("{date_part} {offset_str}");
-                        }
+                        // Get timestamp from parsed date (which is already a Zoned)
+                        let ts = parsed.timestamp();
+
+                        // Get the offset for this specific timestamp in the target timezone
+                        let zoned = ts.to_zoned(tz);
+                        let offset_str = format!("{}", zoned.offset());
+
+                        // Replace abbreviation with offset
+                        return format!("{date_part} {offset_str}");
                     }
                 }
             }
@@ -571,7 +577,13 @@ fn resolve_tz_abbreviation<S: AsRef<str>>(date_str: S) -> String {
 
 /// Parse a `String` into a `DateTime`.
 /// If it fails, return a tuple of the `String` along with its `ParseError`.
-// TODO: Convert `parse_datetime` to jiff and remove wrapper from chrono to jiff structures.
+///
+/// **Update for parse_datetime 0.13:**
+/// - parse_datetime 0.11: returned `chrono::DateTime` → required conversion to `jiff::Zoned`
+/// - parse_datetime 0.13: returns `jiff::Zoned` directly → no conversion needed
+///
+/// This change was necessary to fix issue #8754 (parsing large second values like
+/// "12345.123456789 seconds ago" which failed in 0.11 but works in 0.13).
 fn parse_date<S: AsRef<str> + Clone>(
     s: S,
 ) -> Result<Zoned, (String, parse_datetime::ParseDateTimeError)> {
@@ -580,12 +592,10 @@ fn parse_date<S: AsRef<str> + Clone>(
 
     match parse_datetime::parse_datetime(&resolved) {
         Ok(date) => {
-            let timestamp =
-                Timestamp::new(date.timestamp(), date.timestamp_subsec_nanos() as i32).unwrap();
-            Ok(Zoned::new(
-                timestamp,
-                TimeZone::try_system().unwrap_or(TimeZone::UTC),
-            ))
+            // Convert to system timezone for display
+            // (parse_datetime 0.13 returns Zoned in the input's timezone)
+            let timestamp = date.timestamp();
+            Ok(timestamp.to_zoned(TimeZone::try_system().unwrap_or(TimeZone::UTC)))
         }
         Err(e) => Err((s.as_ref().into(), e)),
     }
diff --git a/src/uu/touch/Cargo.toml b/src/uu/touch/Cargo.toml
index 55ac39bd89b..f5409ec7a5a 100644
--- a/src/uu/touch/Cargo.toml
+++ b/src/uu/touch/Cargo.toml
@@ -22,6 +22,7 @@ path = "src/touch.rs"
 filetime = { workspace = true }
 clap = { workspace = true }
 chrono = { workspace = true }
+jiff = "0.2.15"
 parse_datetime = { workspace = true }
 thiserror = { workspace = true }
 uucore = { workspace = true, features = ["libc", "parser"] }
diff --git a/src/uu/touch/src/touch.rs b/src/uu/touch/src/touch.rs
index 98d87e3367b..b1581f8f073 100644
--- a/src/uu/touch/src/touch.rs
+++ b/src/uu/touch/src/touch.rs
@@ -15,6 +15,7 @@ use chrono::{
 use clap::builder::{PossibleValue, ValueParser};
 use clap::{Arg, ArgAction, ArgGroup, ArgMatches, Command};
 use filetime::{FileTime, set_file_times, set_symlink_file_times};
+use jiff::{Timestamp, Zoned};
 use std::borrow::Cow;
 use std::ffi::OsString;
 use std::fs::{self, File};
@@ -637,7 +638,41 @@ fn parse_date(ref_time: DateTime<Local>, s: &str) -> Result<FileTime, TouchError
         }
     }
 
-    if let Ok(dt) = parse_datetime::parse_datetime_at_date(ref_time, s) {
+    // **parse_datetime 0.13 API change:**
+    // The parse_datetime crate was updated from 0.11 to 0.13 in commit 2a69918ca to fix
+    // issue #8754 (large second values like "12345.123456789 seconds ago" failing).
+    // This introduced a breaking API change in parse_datetime_at_date:
+    //
+    // Previously (0.11): parse_datetime_at_date(chrono::DateTime) → chrono::DateTime
+    // Now (0.13):        parse_datetime_at_date(jiff::Zoned) → jiff::Zoned
+    //
+    // Commit 4340913c4 initially adapted to this by switching from parse_datetime_at_date
+    // to parse_datetime, which broke deterministic relative date parsing (the ref_time
+    // parameter was no longer used, causing tests/touch/relative to fail in CI).
+    //
+    // This implementation restores parse_datetime_at_date usage with proper conversions:
+    // chrono::DateTime → jiff::Zoned → parse_datetime_at_date → jiff::Zoned → chrono::DateTime
+    //
+    // The use of parse_datetime_at_date (not parse_datetime) is critical for deterministic
+    // behavior with relative dates like "yesterday" or "2 days ago", which must be
+    // calculated relative to ref_time, not the current system time.
+
+    // Convert chrono DateTime to jiff Zoned for parse_datetime_at_date
+    let ref_zoned = {
+        let ts = Timestamp::new(
+            ref_time.timestamp(),
+            ref_time.timestamp_subsec_nanos() as i32,
+        )
+        .map_err(|_| TouchError::InvalidDateFormat(s.to_owned()))?;
+        Zoned::new(ts, jiff::tz::TimeZone::system())
+    };
+
+    if let Ok(zoned) = parse_datetime::parse_datetime_at_date(ref_zoned, s) {
+        let timestamp = zoned.timestamp();
+        let dt =
+            DateTime::from_timestamp(timestamp.as_second(), timestamp.subsec_nanosecond() as u32)
+                .map(|dt| dt.with_timezone(&Local))
+                .ok_or_else(|| TouchError::InvalidDateFormat(s.to_owned()))?;
         return Ok(datetime_to_filetime(&dt));
     }